. Electric railway journal . ift to move the handle, thus preventingunintentional movement. Each handle operates a camwhich in turn engages a swinging latch of a magneticblow-out, quick-break switch which makes and breaksthe circuits to the solenoids in the switch-throwingmechanisms in the street, throwing the switch in thedirection in which the control handle is rotated. Wiringdiagrams of tower control and curb control installationsare shown in Fig. 11. In cases where the operator has many switches to- October 19, 1918 Clear the Track for Berlin 693 handle it becomes advisable to lock the con
. Electric railway journal . ift to move the handle, thus preventingunintentional movement. Each handle operates a camwhich in turn engages a swinging latch of a magneticblow-out, quick-break switch which makes and breaksthe circuits to the solenoids in the switch-throwingmechanisms in the street, throwing the switch in thedirection in which the control handle is rotated. Wiringdiagrams of tower control and curb control installationsare shown in Fig. 11. In cases where the operator has many switches to- October 19, 1918 Clear the Track for Berlin 693 handle it becomes advisable to lock the control handleso that it cannot be moved while a car is passing overthe switch. This is prevented by installing two smallcontactors in advance of the frog on the wire. Thefirst locks the handle by means of a small magnetmounted on the control cabinet and the second con-tactor unlocks it by similar means after the car haspassed the switch. This is a simple form of interlock-ing, and the difficulties created by two-car trains are. FIG. 17—MECHANICAL CONNECTIONS OF AUTOMATIC ELECTRIC TRACK SWITCH FORCONDUIT LINES now being overcome by a similar arrangement appliedto the regular automatic devices. A wiring diagramshowing how this is accomplished should be of is presented in Fig. 13. Apparatus for Operation ofDerails at Crossings A situation somewhat analagous to the traffic condi-tions at congested points is found at busy surfacecrossings of steam and street railway lines. At theseplaces, in addition to the crossing gates, it is a safetyrequirement that the crossing be protected by derailingdevices. Where there is a man required to operate the
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