. Electric railway journal . really constructed todevelop their maximum power at about , cor-responding to a suburban service. In the United Statesthere are no or single-phase locomotives which are as powerful at their maximum running speed as the SimplonTunnel locomotives, which develop a drawbar pull of 13,200lb. at , and the new Simplon locomotives, whichwill develop 3000 hp at the same speed. The Italian StateRailways, also using three-phase equipment, have orderedten locomotives able to develop 2000 hp-2400 hp at 62 While locomotives with a series charact
. Electric railway journal . really constructed todevelop their maximum power at about , cor-responding to a suburban service. In the United Statesthere are no or single-phase locomotives which are as powerful at their maximum running speed as the SimplonTunnel locomotives, which develop a drawbar pull of 13,200lb. at , and the new Simplon locomotives, whichwill develop 3000 hp at the same speed. The Italian StateRailways, also using three-phase equipment, have orderedten locomotives able to develop 2000 hp-2400 hp at 62 While locomotives with a series characteristic are suit-able for suburban conditions, something more approachinga shunt characteristic is required for trunk-line service. Inthis respect three-phase locomotives would be far superiorto the others, as their weight would be considerably less,being something like 66 lb. per hp, while the lightest Amer-ican single-phase locomotive weighs 132 lb. per hp. In theUnited States the question is what drive to adopt for loco-. Speed in Mkles per Hour Curves Showing the Drawbar Pull of Different Classes ofSteam and Electric Locomotives motives capable of hauling express trains. Three radicallydifferent methods have been employed there, namely, con-necting rods, a direct drive and a drive through gear anda hollow shaft. For high speeds the first seems to be pre-ferred. DISCUSSION Roger T. Smith said that for suburban lines the engi-neering problem of electrification had been solved andmerely the commercial problem remained. In the case ofhilly districts there was a critical grade above which elec-tric driving would always pay. In spite of the work whichhad been done in Italy, he thought that either the orsingle-phase system was better than three-phase, owing tothe series characteristic torque, and for speeds up to they were better than steam for the same England the North Eastern Railway was now buildinga very high-tension direct-current line, and a 3500-vol
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