. Electric railway journal . >> 5? loi t; •*«i 1 I ■ I , I I I I I I I I N^ I I I I I r I I Ijj I I ,. Profile Scale SIGNAL LOCATIONS ON OLD YORK ROAD LINE, PHILADELPHIA RAPID TRANSIT COMPANY, ; SHOWING SIGNAL NUMBER SCHEME by grades in combination with curves. These five loca-tions are known locally as Branchtown hill and curve,Ogontz hill and Wanamaker curve, Noble hill and BrookAvenue curve. Edge Hill and Crestmont hill. The ac-companying profiles and plans show the grades andcurves at these locations, at which, prior to the instal-lation of signals, it was customary to detail special
. Electric railway journal . >> 5? loi t; •*«i 1 I ■ I , I I I I I I I I N^ I I I I I r I I Ijj I I ,. Profile Scale SIGNAL LOCATIONS ON OLD YORK ROAD LINE, PHILADELPHIA RAPID TRANSIT COMPANY, ; SHOWING SIGNAL NUMBER SCHEME by grades in combination with curves. These five loca-tions are known locally as Branchtown hill and curve,Ogontz hill and Wanamaker curve, Noble hill and BrookAvenue curve. Edge Hill and Crestmont hill. The ac-companying profiles and plans show the grades andcurves at these locations, at which, prior to the instal-lation of signals, it was customary to detail special dis-patchers, each patrolling a very limited stretch oftrack, to control traffic on the hills and curves. In 1917 automatic signals, comprising sixteen sepa-rate blocks, ranging from 200 ft. to 1,500 ft. in length,grouped at the five locations referred to, were installedfor the purpose of spacing cars as well as assuringextra protection on grades and curves. Upon approaching a signal showing a green light anaa green disk the motorman is permitted to enter theblock with the assurance that there is no ca
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