. The street railway review . s connected by brasscontact shoes, which make connections at each end of the drawwhen it is closed. Third and Track-Rail Connections. The cables connecting the third rail with the sub stations areall of 2,000,000-c. m. section and connections are made directly in 312 STREET RAILWAY REVIEW [Vol. XVI, No. 6. front of the sub-stations. In some cases these short feeders arelocated in conduits and in other cases laid directly in the ground inthe manner as described for the crossing jumpers. Such cableswhen laid in ducts are insulated with 5 32 in. of paper, coveredwith
. The street railway review . s connected by brasscontact shoes, which make connections at each end of the drawwhen it is closed. Third and Track-Rail Connections. The cables connecting the third rail with the sub stations areall of 2,000,000-c. m. section and connections are made directly in 312 STREET RAILWAY REVIEW [Vol. XVI, No. 6. front of the sub-stations. In some cases these short feeders arelocated in conduits and in other cases laid directly in the ground inthe manner as described for the crossing jumpers. Such cableswhen laid in ducts are insulated with 5 32 in. of paper, coveredwith a layer of sheathing l/% in. thick. Near each sub-station the third rail is interrupted by a Should any section break down it is then impossible for asingle car to bridge the gap between the live rail and the groundedone, thus avoiding the possibility of injury to the car wiring andequipment. The east and westbound tracks are in most cases sup-plied by a separate set of feeders and are not cross connected except 3. _rQ^ MZL SECTIONAL VIEW OF THIRD RAIL AND GUARD. through the station bus-bars. Current can therefore be cut off fromthe section of either track lying between two sub-stations simplyby opening the proper feeder switches in the stations at each end ofthe section. In order that part of a section between two sub-stations maybe disconnected in case of emergency, instead of requiring the wholesection to be thrown out of service, 1,600-ampere capacity, discon-necting switches are installed at suitable intervals between sub-stations. These switches are cut into the third-rail circuit so thatby opening any two of them the section between them will becut out. Normally these switches are kept closed. They are gener-ally located near the cross-overs to enable trains to switch aroundthe opened section on the other track. The switches are of thequick-break, knife-blade type and are located in wooden boxesfastened to the third-rail guard, as shown in one of the illustra
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
