Circuits correspond to A.R.A. signal section recommendations; flagging trains over crossing is required in event of failure.
Wabash installs automatic protection to replace interlocker
Ry. Signaling
Railway Signaling ; 20 , n 8
1927
4 pages
7 Figs.
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
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