Color light absolute permissive block automatics on 83 mi of single track, centralized traffic control on 8-mi zone between two junctions and 2 mi of manually controlled signaling facilitate operation; track and signal diagram of centralized traffic control territory at Albert Lea, Minn, given.
C.T.C. And automatic signals on rock island
Ry Signaling
Railway Signaling ; 32 , n 2
1939
6 pages
Article (Journal)
English
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