Central of New Jersey has adopted practice of installing separately mounted electric lamps with Fresnel lens, to replace oil switch lamps formerly located on main-track hand switches in automatic-block signal territory; reflex button sign for derails.
New switch lamps and reflectors
Ry. Signaling
Railway Signaling ; 23 , n 7
1930
2 Figs.
Aufsatz (Zeitschrift)
Englisch
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