Abstract
The article presents the results of nationwide surveys on the causes of delays during the implementation of rail investments in Poland, carried out in the Design & Build formula for the design stage. The study did not examine typical causes of threats to general construction works, only those that result from the specifics of works at rail facilities. The survey was conducted with the participation of experts from various industries, representing all the key participants in the investment process. The selection of experts was limited to people who have extensive professional experience in implementing rail projects. Statistical analyzes were performed using the IBM SPSS Statistics 23 package. It was used to test χ2 and a one-way repeated measures ANOVA. The greatest threats to the deadlines for the implementation of rail investments in Poland, which were indicated by the respondents as the delay threats of a high importance are: negligence in the preparation of tender documents and problems with obtaining current maps for project purposes from rail geodesic centers. The research results can be helpful when planning future rail investments, calculating the necessary time reserves and increasing the reliability of the set dates of their completion.
Highlights
The implementation of each construction project, especially as complex and difficult as a rail facility is subject to a certain degree of uncertainty
At each stage of the investment process, one must constantly monitor various risk factors that may arise during the implementation of an investment, so as to minimize their impact on a given contract
3.1 Analysis of the frequency of occurrence of specific events. It was analyzed whether the incidence of specific events was similar or different
Summary
The implementation of each construction project, especially as complex and difficult as a rail facility is subject to a certain degree of uncertainty. If a given project is not properly protected against threats, the risk of their occurrence will increase as a result of abandonment of preventive measures, and the effects may turn out to be more serious than those anticipated [1, 2, 3, 4, 5, 6, 7]. In such cases, contract management personnel will be forced to react "ad hoc" to adverse events, without previously prepared scenarios for corrective actions and secured reserve resources
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