24-hr protection afforded at five street crossings on B. and L. E. in Greenville, Pa; unique control circuits with manual cut-outs; semi-automatic control; typical control circuits; operating features.
Flashing-light crossing signals save $3,000 annually
Ry Signaling
Railway Signaling ; 25 , n 2
1932
4 pages
Aufsatz (Zeitschrift)
Englisch
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