. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . ys, and compressed airwhich change the level of the water in the rheostats connected in thesecondary circuits of the motors. Interlocks are arranged for compressed-air-operated switches, trolley, and rheostats. Bow trolleys with rollingcontact were found to be suitable for the low speeds. 346 ELECTRIC TRACTON FOR RAILWAY TRAINS References. Kando: Zeitschrift des Vereines deutscher Ingenieure, 1909, p. 1249, abstracted in E. W., Aug. 11, 1910. Sprecht
. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . ys, and compressed airwhich change the level of the water in the rheostats connected in thesecondary circuits of the motors. Interlocks are arranged for compressed-air-operated switches, trolley, and rheostats. Bow trolleys with rollingcontact were found to be suitable for the low speeds. 346 ELECTRIC TRACTON FOR RAILWAY TRAINS References. Kando: Zeitschrift des Vereines deutscher Ingenieure, 1909, p. 1249, abstracted in E. W., Aug. 11, 1910. Sprecht: Elec. Journal, Dec, Electrical Engineering, Feb. 9, R. J., April 8, 1911, p. 631. SWISS FEDERAL RAILWAY. Simplon Tunnel Line from Brig in Switzerland to Iselle in Italy wascompleted and placed in service, with electric locomotive traction, inJuly, 1907. This tunnel thru the Alps is the longest in theworld. The grade is per cent, thru one-half, and per cent, thruthe other half of the tunnel. The tunnel is very hot and moist, but it isventilated by means of fans, the air having a velocity of 7 m. p. 20I6O 31360 3360O 336 00 20I60. Fig. 121.—Swiss Federal Railway Locomotive, 1907. Two used on Simplon Tunnel. 70-ton, 1100-h. p., 3-phase, 16-cycle, 3000-3000-volt motors for side-rod connection. Mixed service. Water power is used for electric train haulage and comes from twocentral stations having a total capacity of 2700 h. p. The system used is the 16-cycle, three-phase, with 3000 volts on thecontact line, and also on the stator of the motors. Each locomotive has two motors with cranks on the rotors whichconnect thru Scotch yokes to the driver side rods. Two class 2-6-2 locomotives, built in 1907, each have two 550-h. type motors, the control of which is by pole changing in theprimary and resistance in the rotor or secondary. The speed is 21 or43 miles per hour. Two class 0-4-4-0 locomotives, built in 1909, each have two 850
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