Control of all trains at 69th street terminal of Market Street-Frankford subway-elevated lines, of Philadelphia Rapid Transit Co, facilitated by installation of new interlocking plant; Union Switch and Signal Co, Model 14, electropneumatic interlocking machine, having 18 working levers and 21 spare spaces, is of sufficient capacity for ultimate track layout.
Controlling 800 trains a day
Transit J
Transit Journal ; 82 , n 8 ; p 270-271 + 298-299
1938
2 pages
Article (Journal)
English
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