In the paper the results of experimental-and-theoretical evaluation of strength indices for central swing bolsters of diesel trains DR1A are presented and the variants of modernization and improvement of the strength indices are recommended.

In paper results of impact tests of electric locomotive DS3 are submitted.

The experimental research of the bandage wear has fun conducted concerning electric locomotive performance under the mountain conditions of the Lvov railway. The operation periods of an electric locomotive have been considered as for the various wheel profile structures.