TY JOUR TI Development and Validation of a Spring Suspension Spatial Dynamic Model for the TEM2 Shunting Locomotive KW TEM2 shunting locomotive KW spatial dynamic model KW spring suspension KW vertical dynamic coefficient KW frame forces KW universal mechanism KW modelling of the underframe part KW damping characteristics KW numerical validation JO Bulletin of scientific research results AU Grigor'ev, P.S. AU Kodirov, N.S. PY 2025 IS 2025 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"