. The street railway review . Pennsylvania Railroad Companys bridge. The speedmaintained on the overhead system is forty miles perhour with 550 volts, and the underground system tenmiles per hour with 220 volts. The cars are run in trains consisting of a motor carand from two to three trailers, the former complete,unloaded, weighing about twenty and the trailers twelvetons each; double truck. These cars are 40 feet long,are equipped with air brakes and the motors are mountedon maximum traction trucks. The current for the overhead trolley lines is furnishedby two power houses on the Virginia si
. The street railway review . Pennsylvania Railroad Companys bridge. The speedmaintained on the overhead system is forty miles perhour with 550 volts, and the underground system tenmiles per hour with 220 volts. The cars are run in trains consisting of a motor carand from two to three trailers, the former complete,unloaded, weighing about twenty and the trailers twelvetons each; double truck. These cars are 40 feet long,are equipped with air brakes and the motors are mountedon maximum traction trucks. The current for the overhead trolley lines is furnishedby two power houses on the Virginia side of the river, ^ig:.. while the underground conduit in Washington is fed bythe electric light company. The underground system is very substantiall} con-structed, having a concrete conduit 25 inches in depth,heavy girder rails and cast iron yokes, with positive and negative conductor rails suspended by porcelain insula-tors, the electric plow having sliding contact with theconductor rails. (Jne of the most novel and interesting features of thiscompan\s system is the automatic change from theunderground to the overhead trolley, detaching theelectric plow while running at full speed, the generalplan and details of which are shown in the accompany-ing cuts. This is the joint invention of W. B. Upton,consulting engineer, S. G. Brosius, chief engineer andJoseph Colvin, electrical engineer of the road. The plow (when the car is on the conduit portion ofthe route) is in position on its supporting hangers,attached to the car truck, and is supplying current to themotors through automatic contact boxes. When the cara
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
