TY JOUR TI DYNAMIC MODEL OF 2TE25A DIESEL LOCOMOTIVE CARRIAGE KW diesel locomotive KW carriage KW wheelset KW coefficient KW clutch KW Polach's model KW dynamics KW result KW modeling KW wear JO Transport engineering AU Perfil'ev, K.S. AU Volohov, G.M. AU Zhuravlev, S.N. AU Oganyan, E.S. PY 2026 IS 2026 PB Bryansk State Technical University