Details of all-relay interlocking installed at Promenade street in Providence, RI, by New York, New Haven and Hartford Railroad, to replace two previous interlockings. first of which was 77-lever electric plant and second was 40-lever mechanical interlocking.
New all-relay interlocking at providence, R. I., on New Haven
Ry Signaling
Railway Signaling ; 37 , n 4
1944
5 pages
Article (Journal)
English
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