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)


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    Title :

    Pere Marquette installs dwarf signals as automatics in Detroit terminals


    Additional title:

    Ry Age


    Published in:

    Railway Age ; 93 , n 19


    Publication date :

    1932


    Size :

    2 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Pere Marquette installs C.T.C.

    Engineering Index Backfile | 1947


    Pere Marquette installs C.T.C.

    Engineering Index Backfile | 1946