. Electric railway journal . particularly when performed under war con-ditions. The electric railway spur consists of a double track,terminating in a loop at the main entrance to the yards,with an inner loop track. The track crosses the Penn-sylvania main-line track to Sparrows Point and two nals and derails, was required. After careful studythe electro-pneumatic type of track circuit signal wasselected as one which would provide Safety with re-quired speed of operation and a contract for the latesttype material and its erection was awarded to theUnion Switch & Signal Company of Swissvale, Pa.
. Electric railway journal . particularly when performed under war con-ditions. The electric railway spur consists of a double track,terminating in a loop at the main entrance to the yards,with an inner loop track. The track crosses the Penn-sylvania main-line track to Sparrows Point and two nals and derails, was required. After careful studythe electro-pneumatic type of track circuit signal wasselected as one which would provide Safety with re-quired speed of operation and a contract for the latesttype material and its erection was awarded to theUnion Switch & Signal Company of Swissvale, Pa., thesame company which had equipped the main line withautomatic signals. This interlocking plant controls the two branch-offswitches, two switches in the yard tracks, two Hayesderails on the U. R. & E., four Hayes derails on theyard tracks, seven color light-type signals on the & E., two high main-line-type position-light signalson the P. R. R. and four dwarf-type position-light sig-nals on the yard 932 Electric Railway Journal Vol. 55, No. 19 The signaling at the branch-off or junction is suchthat southbound cars are given either an indication tothe main track (straight) or to the branch and north-bound cars from the main line or from the branch, thesignals being selected according to routes establishedby the position of the switch in advance. These signals are also a part of the block system andas such are controlled by track circuit to the next sig- 2-/0-
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