00696naa#a2200181#i#450# EN\\bibl\81858 20241231101032.2 2412-9186 20170625b2017####ek#y0engy0150####ca RUS RU Development of signaling devices in the period of imperialism (1906-1917). Part 2: Regulation of traffic, electric rod system and open line block Journal article Saint-Petersburg FSBEI HE "Emperor Alexander I St. Petersburg State Transport University" 2017 9 с. Journal article local Меры безопасности. Сигналы. 656.25 RUS Lupal Nicolay V atjournal.ru