00784naa#a2200181#i#450# EN\\bibl\109369 20251213002636.6 1815-588X 20251205b2025####ek#y0engy0150####ca RU Determining the Degree of Residual Deformation Accumulation in the Ballast Prism of a Railway Track by Analysing the Intensity of Ballast Gravel Contamination with Coal Dust Journal article Saint-Petersburg FSBEI HE "Emperor Alexander I St. Petersburg State Transport University" 2025 10 с. Journal article local Выбор и качество балластных материалов. 625.141.1 Kachalkin Andrey Vyacheslavovich Kolos Aleksey Fedorovich itt-pgups.ru