Electric interlocking with panel type control machine and all relay circuits installed at Philadelphia, Pa, which with certain track changes, consolidated control of layouts formerly handled by two mechanical interlockings, one on drawbridge over Schuylkill river, and other at Eastwick; control and indication of remote facilities.
New drawbridge interlocking on Baltimore and Ohio
Ry Signaling
Railway Signaling ; 41 , n 1
1948
5 pages
Article (Journal)
English
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