TY  JOUR
TI  Signals and interlocking development during imperialism (1906-1917). Part 4: Safety devices
KW  safety of operation
KW  color light signal
KW  key interlocking
KW  traffic hazard
KW  fatal crash
JO  Transport automation research
AU  Lupal, N..
PY  2017
IS  
PB  FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"