TY JOUR TI Improvement of Gondola Side Pillar Resource Testing Methodology with Respect to Test Load Determination KW Gondola car KW resource tests KW calculation KW methodology KW side pillars KW pillar sealing unit JO Bulletin of scientific research results AU Afanas'ev, A.E. AU Afanas'eva, T.A. AU Derkunova, D.M. PY 2025 IS 2025 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"