00673naa#a2200181#i#450# EN\\bibl\81868 20241124050939.7 2412-9186 20170925b2017####ek#y0engy0150####ca RUS RU Signals and interlocking development during imperialism (1906-1917). Part 3: Mechanical interlocking of points and signals Journal article Saint-Petersburg FSBEI HE "Emperor Alexander I St. Petersburg State Transport University" 2017 11 с. Journal article local Меры безопасности. Сигналы. 656.25 RUS Lupal Nicolay V atjournal.ru