Gondola Car Research Articles

Assessing the stopping brake retention guarantee for an innovative gondola car on the standardized down grade with a 27 t load from the wheelset to the rail

Assessing the stopping brake retention guarantee for an innovative gondola car on the standardized down grade with a 27 t load from the wheelset to the rail

A finite element analysis on mechanical behavior of Al/Al-Mg composites for the design of tank cars under actual measuring loads

The transportation safety of tank cars carrying concentrated nitric acids under conditions of heavy loads has attracted the increasing attention. The use of Aluminum/Aluminum-Magnesium(Al/Al-Mg) alloys to form laminated composites can solve the problems associated with the low corrosion resistance and strength of tank car bodies. In this work, a finite element analysis was used to simulate the tensile tests of the Al/Al-Mg laminated composites. In particular, the stress and strain behavior of the composites under tensile loads was investigated, and the corresponding mechanical properties of the composites were determined, which was verified by the tension test results. Furthermore, the effective load time history was obtained by processing the measuring data of C70E type gondola car body on three typical general railway line. Load spectra of car body were compiled using the rain-flow count method, which was applied to do the fatigue design for 70 t Al/Al-Mg tank body. Most importantly, in conjunction with the SN curve of the base materials and the lap-welded joint, based on the tank car finite element analysis results under various load cases, the fatigue life of the 70 t Al/Al-Mg tank body was calculated based on Miner's linear accumulative damage theory. The results showed a very promising application of such composite materials to meet the safety requirements.

INVESTIGATION OF FEATURES OF DUAL WEAR OF PADS IN BRAKE SYSTEM OF FREIGHT CARS

Purpose. This research is aimed at revealing features of dual wear of pads in the brake system of freight cars. Methodology. The complex of theoretical and operational research concerning the causes and consequences of dual wear of pads, as the most widespread one in the freight cars, was conducted. Using the theory of planning the experiment based on the collected statistical material an adapted mathematical modeling of the dual wear process was performed and negative factors were determined. The Mathcad software and STATISTIKA software application were used. Findings. A comparative analysis of various devices for the uniform wear of brake pads showed insufficient efficiency. It has been established that typical devices of uniform wear of brake shoes (up to 95%) are in damaged condition due to the effect of significant dynamic loads. Therefore, the shoes are bent, pressed with their upper edges to the wheel threads and when driving in trains without braking do harmful friction with the formation of double frictional wear of the working body of the shoes. It has been theoretically proved that in a hinged connection of a vertical lever with a brake beam king post a harmfully acting torque from the gravitational forces is formed, which becomes the main cause of the dual wear of the brake shoes. Kinetostatic analysis, taking into account the dynamic forces in the unsprung parts of the bogie, has allowed establishing the cause of dual wear and determining the possibility of eliminating the specified torque in the existing brake system. According to the R & D and the Ukrzaliznytsia`s order the operational tests on 10 gondola cars constructed by Kriukiv Railway Car Building Works were performed. They confirmed the results of the theoretical studies. Originality. For the first time, it was discovered, the research was initiated and the definition – the dual deterioration of brake pads was proposed. A mathematical regression model was developed for determining the main cause of dual wear of pads in a typical mechanical braking system of three-element bogies. It was adapted the mathematical approach to the planning of experiments with the construction of the corresponding schemes-models, which revealed the malignant moment of forces, bending the break beam on the pendulum suspensions until the upper edges of the brake pads will be pressed to the wheel thread. Practical value. The results of the research can be used in the design, modernization and operation of brake systems for both the operational fleet, as well as a new generation of three-element bogies.

СОВЕРШЕНСТВОВАНИЕ МЕТОДИКИ РАСЧЕТА НА ПРОЧНОСТЬ ВЕРХНИХ ОБВЯЗОК БОКОВЫХ СТЕН ПОЛУВАГОНОВ

Standard rated schemes for a gondola car are considered at the calculation of loading in a car dumper. There are offered refined rated schemes taking into account frozen load unloading at car turning of 90º and a buffer stop displacement of the car dumper. It is shown that the supposed rated schemes allow re-vealing the stress increase in an upper framing as compared with standard rated schemes.

INFLUENCE OF LOADING FROM THE AXLE OF A GONDOLA CAR ON ITS DYNAMIC INDICATORS AND RAILWAY TRACK

Purpose. Increasing the maximum loading from the car axle on the rails during transportation of goods and the speed of movement of railway vehicles will enhance the integration processes between the countries. In order to ensure safe and reliable traffic at the railways it is necessary to improve control, quantitative evaluation of the dynamic loading of the rolling stock, which in the process of its operation is a relevant scientific and technical problem. The purpose of this work is to study the influence of the axle loading increase in gondola cars, taking into account the possible speed increase on their main dynamic indicators and indicators of interaction of rolling stock and track. Methodology. The study was carried out by the method of mathematical and computer simulation of the dynamic loading of a gondola car using the model of spatial oscillations of the coupling of five cars and the software complex developed in the branch research laboratory of the dynamics and strength of rolling stock (BRL DSRS). The initial data for research are as follows: the movement of gondola car of the model 12-532 with typical bogies of 18-100 at the speeds ranging from 50 to 90 km/h in curves with radii of 350 and 600 m, with superelevation of 130 and 120 mm, respectively. Findings. The article analyzes the dynamic qualities of a rolling stock using the example of gondola cars, the calculations are performed using the package of applied programs with sufficient accuracy for practice. During the theoretical studies and simulation, taking into account the processes of freight car oscillation in case of increasing the axle loading, the dependences of the main dynamic parameters, taking into account the movement speed were obtained. Originality. Originality of the work results lies in the study of the influence of increasing the axle loading in gondola cars, taking into account the possible movement speed increase on the dynamic loading in order to solve the problem of forecasting the rolling stock dynamics. The results of theoretical studies, taking into account the movement speed in the curved track sections of small and medium radius were obtained for the first time. Practical value. The application of these results will contribute to improving the traffic safety of freight cars and will improve the technical and economic performance of railway transport.

THEORETIC-PRACTICAL BASIS OF LEVELING OF DEFORMED CARRIER CONSTRUCTIONS BY THERMAL INFLUENCE

Purpose. The proposed study is aimed at justifying the expediency of using the thermal leveling method to correct deformations of car metal structures that take place during their manufacture, operation and repair. Methodology. To achieve this purpose a mathematical apparatus was created, which is based on the methods of mathematical design of the experiment. A generalized universal mathematical record of the optimization study of the thermal leveling of car structures has been developed. Modelling of thermal leveling, using the software complex of CAD systems of Solid Works was carried out, as well as an experimental study of the full-size sample of the cantrail in the gondola car. Findings. On the basis of a generalized mathematical record of the optimization study of the thermal leveling of the railcar constructions, mathematical dependencies were created for the thermal leveling of the center sill and the cantrail in the universal gondola cars. These dependences describe the change in the magnitude of the deformation deflection with the corresponding geometric parameters in the heating zones (deflection of the center sill and the profile of the cantrail) depending on the variation of the controlled variables (geometric parameters of the heating spots and temperature). Auxiliary graphs (binary sections) have been constructed for a reasonable choice of the optimal values of the geometric parameters in the heating zones when using thermal leveling of the occurring deformations in the elements of freight cars during their manufacture, repair and operation. Based on the developed finite element models, the efficiency of thermal leveling has been confirmed. The accuracy of the effect obtained in the course of computer simulation is proved experimentally – elimination of the occurred deflection when applying the welding seam in the element of the car structure was noted). Originality. The developed mathematical apparatus and the model created on its basis for the study of the thermal correction in the car structures allow us to justify the selection of the optimal parameters of the marked correction when they are used to eliminate the deformations that occur in the elements of the freight cars. Practical value. Accounting of the obtained results will help to reduce costs in technological processes in the manufacture and repair of freight cars, which is the basis of the rail car fleet of Ukraine.

Из истории создания конструкций полувагонов

Из истории создания конструкций полувагонов

The use of nonlinear dynamic analysis in the calculation of cargo fall onto the hatch of the gondola car

The article studies how things stand in terms of the determination of the stress-strained state of the hatch cover of the gondola car when the cargo falls on the cover. The methods that are currently used were briefly reviewed. The calculation was performed using nonlinear dynamic analysis in CAE (Computer Aided Engineering) NX system.

INFLUENCE OF THE LONGITUDINAL AND TRANSVERSE DISPLACEMENT OF THE CARGO GRAVITY CENTER IN GONDOLA CARS ON THEIR DYNAMIC INDICATORS

Purpose. Increase in the movement speed of railway vehicles makes it possible to strengthen integration processes with the countries of Europe and Asia and leads to the need to improve control, to quantify the dynamic load of rolling stock to ensure safe and reliable communication on the railways. Therefore, in the process of design and operation of rolling stock, the quantitative assessment of dynamic loads constitutes an urgent scientific and technical task. The purpose of this paper is to investigate the effect of longitudinal and transverse displacement of the cargo gravity center in gondola cars during movement speed increase on their main dynamic indicators –the horizontal and vertical dynamics coefficients, the derailment stability coefficient. Methodology. The study was carried out by the method of mathematical and computer simulation of the dynamic loading of freight gondola car using the model of spatial oscillations of the five cars coupling and the software complex developed in the branch research laboratory of dynamics and strength of rolling stock (BRL DSRS) of the Dnepropetrovsk National University of Railway Transport named after Academician V. Lazaryan. Theoretical studies were carried out during the movement of the 12-532 gondola car model with typical bogies 18-100 with speeds in the range from 50 to 90 km/h in curves with radii of 350 and 600 m, with increases of the outer rail 130 and 120 mm, respectively. Findings. The article presents analysis of the carried out theoretical researches of dynamic qualities of rolling stock using the example of gondola cars. Calculations are performed using the package of applied programs with sufficient accuracy for practice. When performing the theoretical studies and after modeling, taking into account the processes of oscillation of the freight car and cargo at the longitudinal and transverse displacement of its gravity center in the gondola car, the dependences of the main dynamic parameters taking into account the movement speed were obtained. Originality. The article investigates the effect of longitudinal and transverse displacement of the load's gravity center on the dynamic loading of the car in order to solve the problem of forecasting the rolling stock dynamics. The results of theoretical studies taking into account the movement speed in curved track sections of small and medium radius. Practical value. The article has a practical focus. Application of the results will contribute to improving the traffic safety of freight cars and will improve the technical and economic performance of the railway transport.

COMPLEX CALCULATION OF HATCH COVER OF GONDOLA CAR FROM POLYTYPIC MATERIALS WITH INTERMEDIATE S-SHAPE STRAPPING

Purpose. The proposed study is aimed at determining the strength indicators of the hatch cover of universal gondola car with intermediate S-shaped strapping made of polytypic materials under operational loading schemes. Methodology. To achieve this goal, it has been proposed to create a fundamentally new hatch cover design for a gondola car. A feature of the hatch cover is that it consists of two leaves, which along the perimeter interact through the S-shaped strapping. The calculation was carried out using the finite element method implemented in the software environment of CosmosWorks. Findings. The strength indicators of the improved hatch cover design are obtained under operating schemes of its loading. The basic schemes of loading the hatch cover of the gondola car in accor-dance with the normative documents have been adopted, as well as additional ones. To the additional the following are classified as: simulating the opening of the hatch cover during operating loading - the torsion-free (without operation of the torsion (s)) non-simultaneous impact on the supports of the intermediate car frame beam with the maximum opening angle; non-simultaneous opening of the door latches - the hatch cover of the loaded car is supported by door latch for one bracket (the case when one has already knocked out one door latch and the other has not yet had time); pulling (closing) the hatch cover of the unloaded gondola car with a crowbar. It is established that the strength of the hatch cover is ensured. Originality. A developed strength model of the improved hatch cover design of the universal gondola car makes it possible to obtain indicators of its strength under operational loading schemes. The results of the carried out research can be used at designing of bearing designs of bodies of universal gondola cars of new generation with the improved technical and economic indicators. Practical value. The results of the research will contribute to ensuring the strength of the structural elements of the gondola car bodies in operation.

STRUCTURAL-FUNCTIONAL DESCRIPTION OF THE HATCH COVER CONSTRUCTION

Purpose. The work aims at structural-functional description of the existing construction of hatch covers of gondola cars to find possible ways of their modernization and improvement. Methodology. The research and analysis are based on principles of morphological study of technical systems and systems approach. The research takes into account the results of the leading research on the topic, the authors' own development, mathematical justification and computer modeling. Calculation of the structural elements of the rolling stock was carried using modern normative and developed methodologies. Findings. The system approach in creating an innovative hatch cover allowed the design to be presented in the form of a series of interconnected and interacting subsystems, taking into account the main factors of their functioning. Authors developed the structural-functional model of the hatch cover of the gondola car, which showed that the hatch cover plate is the basic element, the structural-parametric and functional properties of which determine the corresponding characteristics of other nodal and base elements of its design. We established that the main functions of the hatch cover are distributed through the constituent elements of the first hierarchical level (between nodes): the frame serves as the reinforcing element of the plate and the base for installing other nodes, except the torsion ones. The proposed theoretical propositions, methodological foundations and practical methods of structural and functional analysis are expedient for using in the search for optimization ways and other elements of rolling stock, as well as objects of transport engineering. Originality. The methodological foundations for the creation of a structural and functional description of the hatch cover are proposed and the results of its implementation are presented, which can be used in studies of the processes of their functioning, perception and redistribution of different types of loads, taxonomy, increasing the degree of their ideality, identification of objects considered in design, repair. Practical value. The structural-functional description allowed projecting an innovative design of the hatch cover, including its frameless execution, a model with a convex design of the plate in the direction of counteracting the mass of the cargo. Using the proposed models of hatch covers, effective modernization of the domestic park of gondola cars is possible.

On the need to control the gauge easement of the natural unevenness of the rail threads in plan in the curved sections of the track

The article is devoted to the problems of analysis and evaluation of the track condition in the plan. The width of the track and, correspondingly, the gauge easement, characterizing the smoothness of the change in track width, are the values determined as the difference in position of the two rail threads in the plan. The shortcomings of gauge easement in the evaluation of the track in curves are considered. The modeling of the empty rolling stock dynamics was performed in the “Universal Mechanism” software package (motion in a shallow curve with speeds from 20 to 90 km/h). The real values of the actual unevenness of the rail threads are taken as a disturbing signal, obtained from the track-meter data with a regular check of the track condition, which are the result of calculating the outlines of the horizontal rail unevenness from the measured rise values. The output of the modeling is the value of the safety factor ( К уст ), which should not fall below the value 1.2 in order to comply with the safety conditions for handling the rolling stock along the track. The article provides the К уст dependencies of the empty gondola car on the size of the gauge easement of the natural unevenness of the rail threads in the plan at various speeds of motion in a shallow curve based on the results of the modeling. It is shown that the gauge easement due to the multivariate combination of the position of the inner and outer rail lengths in the curves is not a parameter that uniquely characterizes the geometry of the track gauge in the curves. Authors substantiate the necessity of amending the “gauge easement” parameter with the parameters of the irregularities in the plan of each rail thread.

Prospects for the Use of Gondola Cars on Bogies of Model ZK1 in the Organization of Heavy Freight Traffic in the Republic of Kazakhstan

The increase in heavy freight traffic in recent years is fueled by an increase in demand for coal as an alternative energy resource of oil, and also steel, in the manufacture of which large quantities of iron ore are required. However, in the former Soviet Union, the use of heavy freight trains was complicated due to insufficient quality of the railway. In this regard, the article considers the features of construction truck wagons of models 12-9941 produced by LLP Kazakhstan car-building according to the project of Qiqihar railway company (PRC). The laboratory testing of rolling stock conducted in Dnipropetrovsk national University of railway transport has identified the main dynamic characteristics that meet the requirements of the international standard. The use of gondola wagons of model 12-9941 in the organization of the heavy traffic creates tensions in the construction of the permanent way, which do not exceed the permissible limits in both straight and curve track sections. DOI: http://dx.doi.org/10.5755/j01.mech.24.1.17710

THEORETICAL BASIS OF PARAMETRIC SYNTHESIS FOR CARRYING SYSTEMS OF CARS

Purpose. The article is aimed to systematize and structure representation of theoretical grounds for the optimization designing of railway car components and practical ways of its implementation. Methodology. The study is based on analysis of several well-known articles on the subject, as well as on authors' researches, some mathematical foundations and computer modeling. The rolling stock components structural analysis was made by applying modern and acknowledged methods. Findings. In the study the authors systematized the set of methodological approaches to the freight car design processes; they also analyzed every application phase of the designing process and its conditions. The article presents the developed mathematical model of the car component implementation. This model takes into account all the calculated cases of the car life cycle. Moreover, the model also can be applied to other transport modes accounting their specific operation modes. The possibility to generate different construction options for equally strong car component with minimum material intensity was also shown in the article. There were several methods developed for finding optimal solutions that make it possible to calculate the sought characteristics of construction elements with the reliable accuracy. The presented variety of different approaches significantly extends engineering apparatus by increasing the synthesis and analysis abilities of the car design. Originality. The authors proposed the methodological foundations of the car components design aimed at creating their optimal structural parameter execution and the operating features based on the results of the detailed research. Practical value. Expediency and effectiveness of the presented methods has been confirmed by positive experience of its application when constructing the general-purpose gondola cars, models 12-9904 and 12-9904-01, as well as when upgrading existing constructions of freight cars, model 12-9745 and the hoper car 20-9749.

REDUCING THE INTENSITY OF TAKEAWAY PULVERIZED COAL BY USING SPECIAL SOLUTION

Purpose. The article is aimed: 1) to develop the coal coating solution in open railway cars or to cover coal piles to minimize the coal dust losses; 2) creating a mathematical model of the process of the solution feeding to the surface of coal. Methodology. To solve this problem, it was developed a special solution containing cheap industrial wastes and semiproducts of chemical industries. It was conducted a physical experiment to assess the intensity of coal dust loss when using the developed solution. A mathematical model based on the use of the motion equations of the ideal fluid and mass transfer was developed. The developed numerical models are the basis of the application program package created for assessing the quality of processing the coal surface by special solution. Findings. The results of the conducted physical experiment to assess the magnitude of the coal dust loss on the model of the coal pile in the processing of its surface with a special solution and without processing are presented in the article. It is shown that the application of the proposed solution for surface processing of coal can significantly reduce the coal dust loss. This makes it possible to reduce the amount of economic losses and reduce the level of air dust pollution in work areas. The results of computational experiments carried out on the basis of the constructed numerical models are presented in the article. Originality. Authors proposed a new solution for the coal surface processing in order to minimize the removal of pulverized coal from the coal pile, which substantially reduces the coal losses. There were created numerical models to take into account the relevant factors influencing the solution dispersion process in the atmosphere from coal processing in gondola cars. Practical value. Solution, proposed in the article has a low price, because it can be created on the basis of industrial production wastes. Application of this solution can significantly reduce the intensity of coal dust losses from the surface of the coal pile. There were considered effective numerical models «diagnostic models» for rapid calculation of cargo processing in gondola cars with the solution. The models may be used in developing strategies of solution feeding to the cargo surface at various atmospheric conditions. The constructed numerical models can be used for scientific substantiation of the parameters of cargo processing with various forms of its surfaces in the gondola car.

Уточнение параметров модели износа Арчарда для вычисления износа колес грузовых вагонов с осевой нагрузкой 25 тс

Целью исследования являлся обоснованный выбор величины коэффициента износа для сильной и слабой стадий изнашивания в модели абразивного износа Арчарда (Archard J.) и коэффициента трения на гребне и поверхности катания колеса для прогнозирования износа профилей колес с использованием динамических моделей. В статье представлены результаты ресурсных пробеговых испытаний грузового вагона на Экспериментальном кольце АО «ВНИИЖТ», измерений твердости колес в зонах поверхности катания и гребня, математического моделирования износа колес в программном комплексе «MEDYNA».

Оценка эффективности эксплуатации грузовых вагонов с улучшенными техническими характеристиками для ОАО «РЖД» на основе проведения испытаний

The article describes the mechanism for evaluating the efficiency of operating freight cars with improved technical characteristics on the infrastructure of railways on the basis of complex tests. It allows determining the impact of the operation of such cars on the costs of JSC “Russian Railways”, including the costs of fuel and energy resources for traction of trains, the maintenance of the railway track, the maintenance and operation of freight locomotives and the maintenance of freight cars along the route. An important feature of the assessment is that it is based on data obtained as a result of testing in real-world conditions. Technical and economic assessment of the change in costs of JSC “Russian Railways” in the case of the operation of innovative freight cars should be used in the development of budgets in conjunction with the plans to purchase new cars, to prepare proposals for the development of tariff mechanisms that stimulate the purchase of cars with improved technical characteristics that provide additional economic benefits, associated with a decrease in the costs of the owner of the infrastructure. The purpose of such mechanisms is, on the one hand, to stimulate the renewal of rolling stock through innovative carriages, on the other hand, to improve the efficiency of rail transport. Based on JSC “VNIIZhT” assessment of the effect for JSC “Russian Railways”, the expert commission of the Federal Antimonopoly Service of the Russian Federation approved the application of the tariff scheme 25 (4) with a reduced fee for the empty run of cars for 12-2143 gondola cars produced by JSC “AltaiZavod”. According to the current price list for freight transportation, the effect of operating a number of models of innovative cars on the infrastructure of JSC “Russian Railways” is fully included in tariff preferences. However, to increase the interest of Russian Railways in the operation of innovative cars, it seems advisable to leave the owner of the infrastructure between 30 and 50% of the economic effect.

FORECASTING OF PERFORMANCE EVALUATION OF NEW VEHICLES

Purpose. The research work focuses on forecasting of performance evaluation of the tractive and non-tractive vehicles that will satisfy and meet the needs and requirements of the railway industry, which is constantly evolving. Methodology. Analysis of the technical condition of the existing fleet of rolling stock (tractive and non-tractive) of Ukrainian Railways shows a substantial reduction that occurs in connection with its moral and physical wear and tear, as well as insufficient and limited purchase of new units of the tractive and non-tractive rolling stock in the desired quantity. In this situation there is a necessity of search of the methods for determination of rolling stock technical characteristics. One of such urgent and effective measures is to conduct forecasting of the defining characteristics of the vehicles based on the processes of their reproduction in conditions of limited resources using a continuous exponential function. The function of the growth rate of the projected figure degree for the vehicle determines the logistic characteristic that with unlimited resources has the form of an exponent, and with low ones – that of a line. Findings. The data obtained according to the proposed method allowed determining the expected (future) value, that is the ratio of load to volume of the body for non-tractive rolling stock (gondola cars) and weight-to-power for tractive rolling stock, the degree of forecast reliability and the standard forecast error, which show high prediction accuracy for the completed procedure. As a result, this will allow estimating the required characteristics of vehicles in the forecast year with high accuracy. Originality. The concept of forecasting the characteristics of the vehicles for decision-making on the evaluation of their prospects was proposed. Practical value. The forecasting methodology will reliably determine the technical parameters of tractive and non-tractive rolling stock, which will meet the modern requirements of the railroading, including at the design stage and while upgrading the vehicles.

HOW TO LOAD EMPTY CARS’ FLOW

For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version).ABSTRACT The topic of increasing the efficiency of empty gondola cars is considered by the authors at the example of the West Siberian Railway. In the process of analyzing the situation, it was revealed that the main problems that have arisen with the multiplicity of owners of rolling stock are a consequence of the lack of a single mechanism for managing cargo flows and are at the interface of interaction with different structures, small and large, federal and local. It is necessary to build a new management system for empty car flows and regulate this system, in particular the roles of participants in the transportation process, including the operator. The technology of operation of companies-operators with a park of empty open cars, the order of normalization and planning of their approach to coal loading stations of the road are shown. Compliance with such technology allows to significantly increase the level of loading of cars, improve the fulfillment of delivery deadlines. Keywords: management, railway, empty car flow, operator, cargo owner, plurality of owners, transportation process. REFERENCES 1.Khusainov, F. I. Reform of the railway industry in Russia: the problems of unfinished liberalization: Monograph [Reforma zheleznodorozhnoj otrasli v Rossii: problemy nezavershjonnoj liberalizacii: Monografija].Moscow, Nauka publ., 2015, 272 p. 2.INFOLine on change of paradigm of the railway market: from surplus of car fleet to a balance with accelerated replacement of outdated rolling stock with innovative [INFOLine o smene paradigmy zheleznodorozhnogo rynka: ot proficita vagonnogo parka k balansu s uskorennym zameshheniem ustarevshego podvizhnogo sostava innovacionnym].http://infoline.spb.ru/m/news/102859/.Last accessed 27.07.2016. 3.Federal Law No.503-FZ dated December 31, 2014 [Federal’nyj zakon № 503-FZ ot 31.12.2014].

THE ASSESSMENT MODELS OF AIR POLLUTION DURING TRANSPORTATION OF BULK CARGO

Purpose. The scientific work is concentrated on development of 3D, 2D numerical models for the prediction of atmospheric pollution during transport of bulk cargo in the railway car. Methodology. To solve this problem numerical models were developed, based on the use of the motion equations of inviscid incompressible fluid and mass transfer, to determine the field of wind velocity near the cars and dispersion of dust in the atmosphere. For the numerical integration of the pollutant transport equation implicit alternating-triangular difference scheme was used. When constructing a difference scheme splitting of the transport equation is carried out that allows us to construct an efficient algorithm for solving a differential problem. Unknown value of the pollutant concentration at every step of splitting is determined by the explicit scheme – the method of point-to-point computation, which provides a simple numerical implementation of splitting equations. For numerical integration of the 3D equation for the velocity potential method of Richardson is applied. For numerical integration of the 2D equation for the velocity potential the method of total approximation is applied. The developed numerical models are the basis of established software package. On the basis of the constructed numerical models a computational experiment to assess the level of air pollution when demolition of coal dust from the gondola car was carried out. Findings. 3D, 2D numerical models that belong to the class «diagnostic models» were developed. These models take into account the main physical factors affecting the process of dust pollution dispersion in the atmosphere during transportation of bulk cargo, but require small costs of the computer time in the practice at the low and medium power machines. These models are used for serial calculations of various situations of scenarios related to issues of environmental protection and pollution intensity diagnostics for different weather conditions. Computational calculations to determine pollutant concentrations and formation of pollution zone near the cars with bulk cargo in «microscale» scale were submitted. Originality. 3D, 2D numerical models were created. They allow taking into account the relevant factors, influencing the process of pollutants dispersion in the atmosphere, and formation of the pollution zone during transport of bulk cargo by rail. Practical value. Efficient numerical models «diagnostic models» for rapid calculation of the atmosphere pollution level during transportation of bulk cargo by rail were considered. Models can be used in the development of environmental protection measures at the operation of rail transport. Proposed model allows calculating 3D, 2D hydrodynamics of wind flow and mass transfer process of pollutants in the atmosphere.