. Electric railway journal . r directlyto the seat of any trouble and eliminates the use of handcars or gasoline cars and the delay incident thereto. The trolley wire is of No. 0000 B. & S., carried by a 7/16-in. Siemens-Martin steel messenger, the hangers beingspaced at 30-ft. intervals and of the Westinghouse drop-forged type. On curves up to 2 deg. no pull-offs are em-ployed between poles. One 300,000-circ. mil copper equiva-lent aluminum feeder is run the full length of the line. The poles were furnished by L. A. Clarke & Son, ofWashington. The steel and copper cables and wires werefurnish
. Electric railway journal . r directlyto the seat of any trouble and eliminates the use of handcars or gasoline cars and the delay incident thereto. The trolley wire is of No. 0000 B. & S., carried by a 7/16-in. Siemens-Martin steel messenger, the hangers beingspaced at 30-ft. intervals and of the Westinghouse drop-forged type. On curves up to 2 deg. no pull-offs are em-ployed between poles. One 300,000-circ. mil copper equiva-lent aluminum feeder is run the full length of the line. The poles were furnished by L. A. Clarke & Son, ofWashington. The steel and copper cables and wires werefurnished by the American Steel & Wire Company, and theoverhead catenary trolley and high-tension details by theWestinghouse Electric & Manufacturing Company. Thework of erecting all poles, high-tension and trolley construc-tion was let to Smethurst & Allen, contractors, of Phila-delphia. RAIL BONDING Rail bonding presented an unusual problem, because the60-lb. rails on the Bluemont line had splice bars that af-. Washington & Old Dominion Railway—Substation at Blue-mont Junction forded no room for concealed bonding and because themanagement proposed to replace these rails gradually withheavier ones. This track was therefore bonded with thetwin-terminal type of bond, which was installed by theAmerican Steel & Wire Company. On the new cut-off,where standard 70-lb. rails and splices were used, the pro-tected type of compressed terminal bond was employed. SUBSTATIONS There are four new permanent substations located, re-spectively, at Bluemont junction, Herndon, Leesburg andRound Hill. There is also a portable substation, intended tobe used for the most part at Vienna, between BluemontJunction and Herndon, at all times except when neededelsewhere as a relay. The substation buildings are of uniform pattern, built of
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