. Electric railway journal . Anchor Cas+inq Casting ^MICHIGAN 2400-VOLT LINE—THIRD-RAIL INSULATOR AND INSULATOR CASTINGS. way crossings these consist of 1,000,000-circ. mil bare-copper feeders suspended from a V^-in. steel messengercable strung from two 30-ft. wooden poles over thecrossing. The ends of the jumper are connected to thethird-rail by special terminals. An overhead clearanceof 21 ft. above the crossing is provided, and the polesare securely anchored to dead men. The same cableand special terminals are used in the jumpers wherethe third-rail joins with the overhead trolley. At these
. Electric railway journal . Anchor Cas+inq Casting ^MICHIGAN 2400-VOLT LINE—THIRD-RAIL INSULATOR AND INSULATOR CASTINGS. way crossings these consist of 1,000,000-circ. mil bare-copper feeders suspended from a V^-in. steel messengercable strung from two 30-ft. wooden poles over thecrossing. The ends of the jumper are connected to thethird-rail by special terminals. An overhead clearanceof 21 ft. above the crossing is provided, and the polesare securely anchored to dead men. The same cableand special terminals are used in the jumpers wherethe third-rail joins with the overhead trolley. At thesepoints, however, the jumpers pass from the third-railto insulators on the latticed steel poles which are stand-ard in all overhead construction. Overhead Construction Three types of catenary trolley suspension are usedat different locations along this new line. Where thereare two tracks, the line is spanned at 300-ft. intervalsby double-track, special-galvanized steel bridges, builtby the Aermotor Company, Chicago. The legs are 32ft. 1 in. long and set 5 ft. in concrete, and this givesa trolley clearance of 19 ft. a
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
