Hump Yard Research Articles

Logical and probabilistic modelling concerning risk of safe functioning violation of hump yard

When carrying out the technical process of breaking and making up trains as well as accumulating carriages on marshalling sidings plenty of dangerous situations may occur. Some of them can lead to safe functioning violation at a hump yard. One of the criteria of the high-quality hump yard control is identification and assessment of violation risks. The development of logical and probabilistic risk model of safety violation at a hump yard for assessing and determining the hump yard safety level has been considered in the paper. The main types of safe functioning violations at a hump yard have been described. They have been served as the basis for working out possible occurrences and forming logical models of dangerous situations on the way of breaking up and making up trains. The obtained models allow determining probabilities of safety violations on separate sections of the way of breaking up and making up trains and throughout the entire route. Comparing to the existing models, a logical connection of possible dangerous occurrences on different route sections of breaking up and making up trains has been taken into account. Hence, there exists a possibility of estimating the safest (or the most dangerous) route on a hump yard.

New solutions in designing mechanized hump yards

For the reduction of investments in the construction and operational costs, associated with the breaking-up and making-up of trains on the mechanized hump yards, the new approach to the design of the plan of yard necks of classification yards was proposed. Transfer of the park brake position to the straight segments within the curved beyond the last railroad switches allows to reduce the length of the calculated path of rolling of cuts and consequently to reduce the cost of the humping track and braking of cuts. Thus, the required brake power of retarders of the drain part of the hump yard and the park brake position is reduced. New design solutions on the placement of retarders of park brake position on tracks with minimal inter-track space were developed, namely the allocation of retarders of one bunch in the general cut-off trench with the arrangement of steps in each inter-track space on both sides of the trench; the displacement of the control equipment of retarder on the inter-track space axis for compliance with the loading gauge and structure gauge, and the corresponding displacement of the high-pressure air pipelines for the switching-on of retarders

Дослідження допустимих режимів гальмування відчепів на сортувальних гірках

The paper presents the research results of cuts braking modes in hump yards.The objective of this paper is developing the methods for assessment of braking modes of cuts under conditions of fuzziness of their rolling properties, as well as selecting the admissible starting speed range of cuts from brake positions.As a criterion for assessing the modes of target control of cut rolling speed, it was proposed to use an average window size on a sorting track at the established norms of probable exceeding of admissible speed of wagons at their collision and stop in retarders.As a criterion for evaluating the modes of a cut rolling speed interval control, using the risk of their non-division on the railway points was proposed.Using the simulation modeling and mathematical statistics, the configuration of admissible starting speed range of cuts from brake positions has been set.The scope of this range is 76.7% of admissible starting speed range of cuts from brake positions with respect to target braking terms.The conducted tests allow simplifying the choice of cut braking modes in systems of automatic control of their rolling speed

Аналіз відомих пристроїв закріплення составів і загородження колій у сортувальних парках

У статті проведено докладний аналіз відомих пристроїв закріплення составів та загородження колій у сортувальних парках залізничних станцій. Зроблено висновок, що в існуючому вигляді жоден з розглянутих пристроїв не може бути використаний на вітчизняних залізницях без додаткового доопрацювання, проте доцільність їх застосування на мережі залізниць України є беззаперечною.

Investigation of influence of rate of breaking up of train sets on processing capacity of marshalling hump yards

In this paper the influence of rate of breaking up of train sets on conditions of uncoupling the train cuts and the number of cars, which need repeated marshalling due to their non-separation on hump switches, is investigated. A computation procedure for the processing capacity of marshalling hump yards is improved.

Reducing the threat of in-transit derailments involving dangerous goods through effective placement along the train consist

Train derailments are important safety concerns, and they become increasingly so when dangerous goods (DG) are involved. One way to reduce the risk of DG derailments is through effective DG railway car placement along the train consist. This paper investigates the relationship between DG railway car placement and derailment for different route attributes and DG shipments. A model is presented for estimating the probability of derailment by position, based on the estimated point of derailment (POD) and the number of cars derailing. A DG placement model that considers in-transit derailment risk is shown to provide a sound scientific basis for effective DG marshalling in conventional rail hump yard operations.

DATA OF A HUMP YARDS AND FACTORS AFFECTING ON THEM

A kind of regression equations, which adequately describe the correlation between the error of braking of cuts, the slope of hump-yard tracks and the indices of hump yard work taking into account the influence of parameters of wagon stream processed, is determined.

Model systems control the movement of rolling stock on humps

The structure of control system model of rolling stock movement for simulation of a process of braking-up and making-up of freight trains on hump yards is presented. The model is made on the basis of weighted directed graphs. The model can be used in computer simulators for switching foremen as well as in software complexes for estimation of plan and profile of hump yards.

Improving of the humps safety

It is offered to improve the functioning safety of hump yards by means of a solution of problem of checking the tracks occupancy using the spectra correction method.

Technical means of mechanization and automatization of the sorting process at the hump yards

The history of development of working technology and technical equipment of the marshalling devices for reclassification of wagons at Ukrainian and foreign railway stations is analyzed. The description of modern automated systems of managing the process of breaking-up trains is presented. The necessity of preliminary estimation of automation for the marshalling complex is indicated.

Case studies measuring the benefits of the HSS hump sequencing model

A model, entitled HSS, for selecting the sequence in which trains are to be humped in a rail hump yard, was applied to the Canadian National Railways' Taschereau Yard in Montreal. Based on the promising results of an eight-train pilot study, two separate case studies were performed. The first study compared FIFO and HSS in sequencing the 57 trains that arrived during a 24-h period. The other compared current operations and HSS in sequencing the 169 trains that arrived during a three-day period. Both showed improvements using HSS, with estimated time savings of about 3 and 0.6 h per car at Taschereau Yard, and corresponding estimated inventory savings of about $4000 and $700 per day, respectively. Keywords: humping, HSS, sequencing, railcars.

Some physics at the railroad hump yard

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Estimation and control problems in hump yards

Estimation and control problems in hump yards