. The street railway review . ET RAILWAY REVIEW. [Vol. XI, No. 4- VALENTINE ELECTRO-MAGNETICAL BLOCKSIGNAL. Mr. D. Valentine, chief engineer of the Old Colony Street Rail-way Co., at Brockton, Mass., has recently placed on the market animproved automatic block signal system for single track roads, theworking of which will be understood by reference to the accom-panying half-tone engravings and wiring diagram. The system employs as the visual signal two semaphores at eachturnout, a white disk for the caution or permissive signal, and ared disk for the danger or stop signal. Safety or go-ahead i
. The street railway review . ET RAILWAY REVIEW. [Vol. XI, No. 4- VALENTINE ELECTRO-MAGNETICAL BLOCKSIGNAL. Mr. D. Valentine, chief engineer of the Old Colony Street Rail-way Co., at Brockton, Mass., has recently placed on the market animproved automatic block signal system for single track roads, theworking of which will be understood by reference to the accom-panying half-tone engravings and wiring diagram. The system employs as the visual signal two semaphores at eachturnout, a white disk for the caution or permissive signal, and ared disk for the danger or stop signal. Safety or go-ahead isindicated by turning the edges of both disks toward the motorman. The path of the current in actuating the disks will be seen by re-ferring to the wiring diagram, which shows the complete wiringfor one section between two turnouts. The trolley wheel, just as the car leaves a turnout, makes con-tact between the trolley wire and a plain piece of bar iron 2j4 in,wide, and 2 ft. long, suspended over the trolley wire. The current.
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
