Boston Elevated Railway, operating unified system of elevated, subway, and surface rapid transit lines, covering Boston, Mass, and vicinity, has converted three interlocking plants to semi-automatic operation under control of motormen; illustrations and diagrams given.
Semi-automatic interlockings on Boston elevated
Ry Signaling
Railway Signaling ; 30 , n 2 ; p 94-95 + 97
1937
Article (Journal)
English
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