. Official proceedings . nt of three trick operation at all points in theterritory controlled, so that he is not confronted with thesituation oftentimes occuring under present methods of oper-ation where trains are lost for a considerable period of timewhile running past one or two—and at night often more—unattended block stations. The other parts of the system—the SIGNALS, POWERSWITCH MECHANISMS and TRACK CIRCUITS—are ofthe standard types which have given reliable operation formany years in power signalling and interlocking. If there is likely to be a considerable amount of switchingnecessary
. Official proceedings . nt of three trick operation at all points in theterritory controlled, so that he is not confronted with thesituation oftentimes occuring under present methods of oper-ation where trains are lost for a considerable period of timewhile running past one or two—and at night often more—unattended block stations. The other parts of the system—the SIGNALS, POWERSWITCH MECHANISMS and TRACK CIRCUITS—are ofthe standard types which have given reliable operation formany years in power signalling and interlocking. If there is likely to be a considerable amount of switchingnecessary at a location equipped with a power operated switcha dual control switch mechanism is advisable in order to relievethe dispatcher of the necessity of operating the switch and 64 signals for each switching move. This dual control mechanismprovides not only for power operation of the switch in theusual way, but the switch may also be operated by hand oninstructions from the dispatcher. In this case, the train crew. The Automatic Train Graph with Train Records desiring to operate the switch by hand unlocks a selector lever(a lever similar to the hand throw lever of the ordinary switchstand) which, after being thrown, cuts th«* oower off of the 65 switch mechanism and leaves the switch free to be thrown bythe usual hand throw lever. The throwing of the selector leverto the hand throw position not only cuts the power off of theswitch mechanism but also sets the signals at stop. Thus anyswitching operations carried out are done so under signalprotection. After hand operation is completed the selector leveris returned to its normal position, thus returning both signalsand switch mechanism to the control of the dispatcher. The Dispatcher Controlled Signal System employs theusual detector or switch locking which insures that a switchcannot be moved by the dispatcher if a train is on the foulingcircuit. In addition, approach locking circuits are provided toprevent the dispatche
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Keywords: ., bookauthorrailwayc, bookcentury1900, bookdecade1900, bookyear1901
