. The street railway review . JACK KNIFE BRIDGE—METROPOLITAN ELEVATED. (^Mte€ty\aiWay-j^y^^ 15 trols everything. Froni the tower on the draw the elec-tric railway system is controlled as follows. Current issupplied to the approaches through the tower. That 400 to 800 feet back on each approach are sectionsof trolley wire controlled h\ leyers in the tower. Oper-. .SKOTCH BLOCK. ated by the tower levers are also derailing switches orskotch blocks on each approach a sufficient distance backto insure that a car could not run over them and getinto the draw. Other levers control danger signal
. The street railway review . JACK KNIFE BRIDGE—METROPOLITAN ELEVATED. (^Mte€ty\aiWay-j^y^^ 15 trols everything. Froni the tower on the draw the elec-tric railway system is controlled as follows. Current issupplied to the approaches through the tower. That 400 to 800 feet back on each approach are sectionsof trolley wire controlled h\ leyers in the tower. Oper-. .SKOTCH BLOCK. ated by the tower levers are also derailing switches orskotch blocks on each approach a sufficient distance backto insure that a car could not run over them and getinto the draw. Other levers control danger signals atthe approaches and mechanisms for locking the drawwhen the signals, switches, are cleared for the elec-tric road. The levers are interlocking so that it is impos-sible to unlock the draw after the signals, have beenset for the electric car to come ahead, and impossible toset the electric road signals to safety unless the draw islocked. Another and most important feature of thisdevice is the provision for preventing the bridge tenderfrom changing the levers and swinging the draw afterthe car has passed the danger signal and derailing switch,and is about to run onto the draw. When once thebridge tender has set the signals and other devices sothat a car can go over the draw, they are automaticall}locked so that he can not change them until the car
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
