. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . operation. The permissive speed control is to savetime, by allowing an engineman to runhis train safely up to another train ordangerous point without being stopped bythe automatic train stop. The enginemanmay do this at the reduced speed, prede-termined by the operating officials, as asafe speed. This is done both by the en-gineman and the speed regulating mech-anism, or automatically. The semi-circular speed control disc isrotated by the U-shaped blade as it passesthrough the curve in the sp
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . operation. The permissive speed control is to savetime, by allowing an engineman to runhis train safely up to another train ordangerous point without being stopped bythe automatic train stop. The enginemanmay do this at the reduced speed, prede-termined by the operating officials, as asafe speed. This is done both by the en-gineman and the speed regulating mech-anism, or automatically. The semi-circular speed control disc isrotated by the U-shaped blade as it passesthrough the curve in the split-ramp. If thecurve is twice as long in the one case as inthe other, the longer curve will properlydeflect the U-blade and rotate the dischalf as fast as in the shorter split-rampor it will allow the train to move twice asfast in order to produce the same result,such as causing the disc to assume themiddle position. A train can run fasterwith safety entering a block than it canon leaving the block to enter one in dan-ger, so the split-ramps are permanentlyinstalled with the long curves near the. —BOTH STOP ANDSPEED CONTROL CIRCUITS OPEN. entrance of a block and the short curvesnear the outgoing end. As long as the track is clear and thesignals show clear, the appliance auto- 150 RAILWAY AND LOCOMOTIVE ENGINEERING. Mav, 1917. matically holds itself from operating thebrake, but when a caution signal is ap-proached the engineman must recognizeit and reduce the speed of his train tothat predetermined as safe. The the push button is a practical acknowUedgmcnt that he cognizes the conditionof afTairs. The engineman also knowsthat he must further reduce the speed ofhis train to a minimum as he passes split-ramp. If he fails to recognizethe caution signal, which is of vital im-portance, the brakes will be applied intime to stop the train in safety, regardlessof the speed it is traveling at. This appliance is said to meet all the lequirements
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
