. Electric locking . e used with the last arrangement. Bolt Lock Protection. At a crossing located close to aninterlocking and where the traffic does not warrant the expense of 106 ROUTE LOCKING an individual plant, the derails can be bolt-locked and the bolt-locking controlled from the tower. Thus, the towerman mustrelease the derails before the conductor can throw them, whichwill allow each to test the veracity of the other as to whether atrain is approaching; in other words, the responsibility for thesafety of the car is placed on both men. As an additional pro-tection, locks controlled thr
. Electric locking . e used with the last arrangement. Bolt Lock Protection. At a crossing located close to aninterlocking and where the traffic does not warrant the expense of 106 ROUTE LOCKING an individual plant, the derails can be bolt-locked and the bolt-locking controlled from the tower. Thus, the towerman mustrelease the derails before the conductor can throw them, whichwill allow each to test the veracity of the other as to whether atrain is approaching; in other words, the responsibility for thesafety of the car is placed on both men. As an additional pro-tection, locks controlled through track circuits might be placedon the bolt lock lever. Route Locking Only at Interlockings. By the employ-ment of interlocked levers at a grade crossing more protectionagainst improper setting up of routes will be obtained. At acrossing, as shown in the previous figure, a three-lever inter-locking stand will permit the conductor to stop a train at a homesignal. Fig. 102 shows such an arrangement with the levers 1. FIG. 102. and 2 shown as being reversed. The interlocking is arranged sothat levers 1 and 2 must be placed normal before 3 can be re-versed. Furthermore, lever 3 must be normal and lever 1reversed before lever 2 can be reversed. This accomphshes theclearing of signal 1 and opening of derail 3 before the conductorcan leave the stand. Should a train have passed the signals, thehalf reverse lock on the signal lever will prevent the lever frombeing placed full normal, and consequently the integrity of theroute is assured until the train has entered the crossing. Door Lock: There are grade crossings between railroadswhere the protection of an interlocking plant is desired withoutthe attention of a leverman. As a rule the traffic of one roadis small as compared with the other and the route is generallyset for the road with heavy traffic. The arrangement is then topermit the trainman to enter the tower, close the door, but before 107 CQ Tl (QCD (DO)COCL (Ji ELECTRIC LOCK
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
