Automatic block signals installed on 4 mi of double-track line extending from Fort Street Union station in Detroit to Delray Junction interlocking; simplified control circuits with no line wires include polarized track circuits using retained-neutral relays; wiring diagram showing control circuits for 3-position signaling without line wires. (See also Ry Signaling v 25 n 12 Dec 1932 p 353-5)
Pere Marquette installs dwarf signals as automatics in Detroit terminals
Ry Age
Railway Age ; 93 , n 19
1932
2 pages
Aufsatz (Zeitschrift)
Englisch
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Pere Marquette installs dwarf signals as automatics in Detroit terminals
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