Results of experimental researches of electric locomotive ДС3-001 on influence for a way to straight, curve radius of 400 and 600 m and also in limits стрелочных translations of mark 1/9 and 1/11 are given.

The article presents the outcomes of experimental and theoretical research on determination of allowed train running speeds on the segments of track repaired in conditions of long-time section closure, with the use of track maintenance machines RM-80 (or a similar one), VPR or Dynamic Track Stabilizer, and gives the guidelines on development of technological processes of track repair with use of the above-mentioned machinery.

In clause offers on technology of performance of modernization of a way are formulated on is long the closed site. On the basis of the analysis of results theoretical and experimental researches recommendations on an establishment of admitted speeds of movement of trains in curves after performance of modernization are formulated on is long the closed site.

The results of analysis of the rolling stock derailment in curve track sections, which took place on Ukrainian railways, are presented. The distribution of derailments under influence factors such as: the curve radius, the rolling stock speed, the type of a rolling stock derailed, and the derailment causes has been investigated. Also the analysis of track condition in curve sections according to the data of track measuring cars has been carried out.