. Electric railway journal . ority and reliability. On these locomotives, the motors are of practicallystandard design and they present no features of specialinterest except the large continuous capacity of 375 the fact that each has a potential of 1500 voltsacross its brushes, operating two in series on 3000 motors are geared to the axles through twin gears,an arrangement that has proved so successful on theButte, Anaconda & Pacific, Detroit Tunnel, Baltimore &Ohio, Cascade Tunnel, and other electrifications havingoperating records of several years with this method ofdrive. I
. Electric railway journal . ority and reliability. On these locomotives, the motors are of practicallystandard design and they present no features of specialinterest except the large continuous capacity of 375 the fact that each has a potential of 1500 voltsacross its brushes, operating two in series on 3000 motors are geared to the axles through twin gears,an arrangement that has proved so successful on theButte, Anaconda & Pacific, Detroit Tunnel, Baltimore &Ohio, Cascade Tunnel, and other electrifications havingoperating records of several years with this method ofdrive. In the St. Paul locomotive construction, the mo-tors are spring suspended on the bolster and also drivethrough springs in the twin gears, thus providing greatflexibility, cushioning all shocks and eliminating allnoise of grinding gears. The high efficiency, simpleconstruction and low cost of twin-gear drive werefundamental facts of importance influencing its adop-tion on the St. Paul locomotive, and the results of six. ST. PAUL ELECTRIFICATION—PASSENGER TRAIN DESCENDING A 2 PER CENT GRADE 1132 ELECTRIC RAILWAY JOURNAL [Vol. XLVII, No. 25 months operation fully justify the preference for this design. The efficiency from trolley to the rim of drivingwheels approximates 89 per cent, including all motorand gear losses when delivering full rated tractive ef-fort. The construction is simple, rugged and well ableto withstand the strains incident to heavy train haulageover mountain grades of 2 per cent, one such grade onthe St. Paul extending unbroken for 21 miles over themain divide of the Rocky Mountains. During sixmonths of operation no failure or delay of any kindhas been due to the twin gear drive, and all indicationsare that in this item cost of upkeep will be small. The St. Paul freight locomotives are rated at 2500tons trailing load on a 1 per cent grade, and this callsfor a tractive effort of 72,500 lb. and a current input tothe motors of 860 amp. at 3000 volts, the speed bei
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