Notes on flashing-light signals to be installed on Southern Railway at 28 crossings in North Carolina and 5 in South Carolina, as part of Public Works program in North Carolina; use of a-c primary battery power supply system and wooden relay case to prevent frost troubles are features.
Crossing signals on Southern
Ry Signaling
Railway Signaling ; 28 , n 3
1935
Article (Journal)
English
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