. The street railway review . companies to their interlock-ing apparatus. The several elements as mentioned aboveof these interlocking plants are: i. Distant and home sig-nals and derailing switches on the steam lines. 2. Signals(usually home signals only) and skotch blocks (or derailingswitches) on the electric line. 3. The interlocking of thelevers controlling these switches and signals with leverscontrolling the trolley current in sections of the overheadline either side of the crossing. The details of operation of a double track crossing plantare given below and the arrangement of the elec
. The street railway review . companies to their interlock-ing apparatus. The several elements as mentioned aboveof these interlocking plants are: i. Distant and home sig-nals and derailing switches on the steam lines. 2. Signals(usually home signals only) and skotch blocks (or derailingswitches) on the electric line. 3. The interlocking of thelevers controlling these switches and signals with leverscontrolling the trolley current in sections of the overheadline either side of the crossing. The details of operation of a double track crossing plantare given below and the arrangement of the electric circuitsis shown in the diagram. The details of the circuits willof course vary somewhat in different cases, but in generalthey are the same. In October, 1897, the Calumet Electric Street Railwayand the Chicago & Western Indiana Railroad jointly in-stalled an automatic and electrically controlled interlockingplant where the two lines cross at Kensington, 111.; thework was completed and the plant put in operation No-. WIRING OF KENSINGTON PLANT. vember 15, 1897. This crossing is a particularly dangerousone, the street in which the Calumet tracks are laid slopingtoward the railroad from both directions; the grades are3 per cent on both sides, one being 400 ft. and the other600 ft. long. The location of the signals and the arrangement of theelectric circuits are shown in the diagram. It has beenfound best to keep the railroad blocked except whencleared for a train and the street kept clear. One of thethree steam tracks is a siding and skotch blocks onl} areprovided at the crossing. If a car arrive from the north on the south-bound track,it passes over a circuit breaker about 300 ft. from the cross-ing and enters an insulated section of trolley wire. Thecontroller is left on for say 20 ft. while on this section andthen the car is brought to a standstill. By referring to thediagram it will be seen that this has drawn the current fromthe feeder in the switching tower through a 2
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
