%0 Journal Article
%T Signals and interlocking development during imperialism (1906-1917). Part 4: Safety devices
%A Lupal, N..
%K safety of operation, color light signal, key interlocking, traffic hazard, fatal crash
%J Transport automation research
%D 2017
%N 3
%P 10
%I FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"