. Railway age . all, having ;=uredhimself of a clear track, gives a signal to the operator at BowlingGreen and one train may be admitted to the south tube from theBrooklyn end—a reversal of the traffic; and after it is once admittedthe signals admitting to the tube are locked beyond control of theoperator at Bowling Green. In case of an accident to the trainfrom Borough Hall, and the fact is communicated to Bowling Green Fig. 4—Sketch of Illuminated Track Indicator. grade each side from the lowest jroint is l!.l per cent., the loiiglliof the incline on the Brooklyn side being nearly .JO
. Railway age . all, having ;=uredhimself of a clear track, gives a signal to the operator at BowlingGreen and one train may be admitted to the south tube from theBrooklyn end—a reversal of the traffic; and after it is once admittedthe signals admitting to the tube are locked beyond control of theoperator at Bowling Green. In case of an accident to the trainfrom Borough Hall, and the fact is communicated to Bowling Green Fig. 4—Sketch of Illuminated Track Indicator. grade each side from the lowest jroint is l!.l per cent., the loiiglliof the incline on the Brooklyn side being nearly .JO per cent, greaterthan on the New York side. Full-block overlaps are provided givingtwo clear blocks in advance of each train, and they vary in lengthfrom 800 ft. to 2,400 ft., as shown upon the accompanying engrav-ings. Circuits are so arranged as to make it possible to run trainsin either direction on either track, thus providing for single-trackoperation in case of emergency or when track work is going Fig. 5—Fire-Proof Fixtures at Switches. by telephone, the operator at the latter point can tie up the line atBorough Hall so that no other train can be admitted to the tubefrom the Brooklyn end. In the signal cabiu at Bowling Green there is an illuminateidtrack indicator, illustrated in the accompanying engravings. Pri-marily, the indicator consists of a case with a glass front on whichare shown representations of the two tubes divided into blocks cor-responding in proportionate length to the actual blocks. All of theglass e.\cept the representations of the longitudinal sections of thetubes is painted and made opaque. The tube sections normally ai>-pear green (clear of trains) and are illumLnated by incandescentlamps within the case. A relay at each signal is connected up withthe lamps in the indicator circuits in such a manner as to changethe color of the space on the indicator representing a block from
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
