The work contains a collection and analysis of freight wagon derailment statistics on Latvian Railroad in the period of 1997 – 2009. An experiment of defining loads, promoting derailment of freight wagons when passing curvilinear space intervals, was carried out. Values of Coulomb friction parameters in supporting nodes were figured out experimentally, allowing the definition of bogie rotation antitorque moment towards wagon body for various type freight wagons, when passing curvilinear space intervals. Cut dynamics in retarder position of gravity hump was investigated in order to find out the possible reasons of wagon derailment at gravity marshalling yards. Recommended guidelines are offered to decrease bogie rotation antitorque moment towards wagon body and derailment at gravity marshalling yards.