. The Street railway journal . olling the locks on the switch levers. The useof these short-track circuits with the controlling wires to theinterlocking machine, makes possible at small expense theuse in the interlocking tower of illuminated track will consist of a track plan of the interlocking painted on apiece of ground glass with the track circuit sections divided on the back of the glass into separate compartments in whichare a red and a white electric light. When the track sectionis occupied a red light will be shown on the indicator plan,and when unoccupied a white light wi
. The Street railway journal . olling the locks on the switch levers. The useof these short-track circuits with the controlling wires to theinterlocking machine, makes possible at small expense theuse in the interlocking tower of illuminated track will consist of a track plan of the interlocking painted on apiece of ground glass with the track circuit sections divided on the back of the glass into separate compartments in whichare a red and a white electric light. When the track sectionis occupied a red light will be shown on the indicator plan,and when unoccupied a white light will be shown. In places like the Grand Central Terminal, where the trackswill be entirely roofed over, it will not be possible for thesignal man to observe the movements of many of the trains;and an indicator of this kind is an absolute necessity to enablehim to keep in touch with the situation. A plan of the sig-naling in the upper or express level of the Grand CentralTerminal is shown in Fig. 14. As fn the Park Avenue tunnel,. FIG. 13.—LAMP SIGNAL the signals in the Grand Central Station interlocking will beshown entirely by lights without any blades or moving this interlocking work, however, the lever for the signalcompletes the circuit for the lamps to give the proper colorfor the indication required. The signal towers will be ofbrick and of very attractive design, with as much windowspace as possible. 9i6 STREET RAILWAY JOURNAL. [Vol. XXVIL No. 23. REPORT OF THE ELECTRIC RAILWAY TESTCOMMISSION-IL REVIEWED BY LOUIS BELL PH. D. The tests of the Commission on the subject of Air andTrain Resistance Tests are particularly valuable for beingconducted on ordinary standard trucks and with standardhigh-speed motor equipments for interurban cars. The sub-ject is one which has provoked great discussion, and themany formulae which have been brought forward have beenexceedingly divergent. Of course, so far as air resistancealone is concerned, the results of the Berlin-Zossen
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
