Crossing of light-traffic single-track line and heavy-traffic fourtrack line is adequately protected by inexpensive arrangement of normally closed power gates and normally clear searchlight dwarf signals.
Railway crossing gates power operated on D.S.S. and A.
Ry Signaling
Railway Signaling ; 26 , n 10
1933
2 pages
Aufsatz (Zeitschrift)
Englisch
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