Identifier: electricrailway421913newy (find matches)
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: (New York) McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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. the signals are held in clear position by power and theyfall to stop position by gravity in case of any derange-ment of the wiring, the signals at each end of the blockbeing electrically interlocked so that a car cannot entera block until the signal at the opposite end has actuallymoved to stop. In another form of the trolley contact system—theChapman signal—the indications are given by a pivotedarm painted red which assumes different positions infront of a white disk or background. The arm is illumi-nated at night by a bank of lamps carried in a hoodwhich extends out over the front of the signal and whichserves to reflect the light against the arm and to make itstand out prominently against its white background. The signal indications consist of a horizontal positionof the arm as a stop sign for opposing movements, avertical position of the arm as a permissive followingmovement indication and a 45-deg. position as a normalor neutral indication. The latter position is assumed by
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= View on Terre Haute, Indianapolis & Eastern, Showing Light Signals for Adjoining Blocks Mounted on One Mast This is designed for use with double-end sidings withspring switches where cars invariably pass to the right.In this case contactors without directional sense may beused if one is set over each track at the siding. Another form with the directional feature has an addi-tional line wire, required for the rare occurrence of a carrunning into the block against a red signal and having toback out again. The extra wire enables the car to countin on the signal relay for following movements at theopposite end of the block. Thus the car counts out asit backs out of the block without pulling down trolleyunder contactor, the signals being left in exactly the samecondition as before its entrance. This type protects allpossible shifting movements. In case absolute preventionof false clear indications is desired, a third form of thissignal is furnished. In this, by means of four line wir

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