. Traction électrique pour les trains de chemin de fer; un livre pour les étudiants, les ingénieurs en électricité et en mécanique, les surintendants de la force motrice et autres .. . f des pistes. En accélération, les roues semblent patiner facilement sur la moitié arrière. Les vibrations de toute la locomotive sont excessives, et ont causé beaucoup de rupture au niveau des bornes de fil, des couphngs et des raccords; desserrage des boulons et écrous les plus serrés; rupture des grilles du rhéostat; desserrage des doigts de contacteur; secouage des cavaliers de commande HNE du train; et ouverture des joints au niveau des connexions électriques lourdes. , DESCRIPTION DES LOCOMOTIVES À COURANT DIRECT

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. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . f from the tracks. In acceleration the wheels seem to spin readily on the rear half. Vibration of the entire locomotive is excessive, and has caused a great deal ofbreakage at wire terminals, couphngs, and unions; loosening of the tightest boltsand nuts; breaking of rheostat grids; loosening of contactor fingers; shaking off oftrain Hne control jumpers; and opening of joints at heavy electrical connections. , DESCRIPTION OF DIRECT-CURRENT LOCOMOTIVES 329 Jackshaft design has not been satisfactory. The weight of the counterbalancehas been increased, but the jackshaft persists in pounding. The jackshaft bearingsand hnings have also given trouble. Smooth running has not been obtained. The locomotives are known as rollersand pitchers and have many of the qualities of modern steam locomotives in heavyhigh-speed-service. References. E. R. J., Nov. 6, 1909; Ry. Age, Nov. 5, 1909.Scientific American, Dec. 18^ 1909.Kirker: Electric Journal, Sept., 1910.Gibbs: E. R. J., June 3, 1911, p. 960. ^.. Fig. 108.—Galt, Preston & Hespler Locomotive, 1910. GALT, PRESTON & HESPLER. Gait, Preston & Hespler Railway locomotive is a good representativelight-weight, inexpensive unit of the two-swivel-truck type with four100-h.p., 50-ton, geared, 600-volt, direct-current motors, for lightfreight train service between small cities. Scores of similar locomotivesare used by interurban railways. ILLINOIS TRACTION. Illinois Traction Company has built about G locomotives per year since1907 for its freight service in Illinois where it has about 560 miles of track. The locomotives are of the 2-truck, swivel type, and resemble acommon baggage car. They weigh 40 tons to 60 tons, and have a length 330 ELECTRIC TRACTION FOR RAILWAY TRAINS of 31 to 34 feet. Eight 36-inch drivers are used. Trucks and motors arepurchased, but the locomotive frames are built by t

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