. The street railway review . station will contain two Westinghouse oil-cooled transformers, supplying approximately volts to thetrolley line. This voltage is by no means an arbitrary limit, but wasdeemed sufficient, though a much higher voltage could be employed. The cars, about 60 ft. long and weighing about 50 tons each, willbe supplied with M. C. B. high-speed trucks, and it is expected thata normal speed of 40 to 45 miles per hour will be attained, witha possibility of 60 miles. .\ branch line from Washington to Laurel, 14 miles, is nowbeing operated by direct-current
. The street railway review . station will contain two Westinghouse oil-cooled transformers, supplying approximately volts to thetrolley line. This voltage is by no means an arbitrary limit, but wasdeemed sufficient, though a much higher voltage could be employed. The cars, about 60 ft. long and weighing about 50 tons each, willbe supplied with M. C. B. high-speed trucks, and it is expected thata normal speed of 40 to 45 miles per hour will be attained, witha possibility of 60 miles. .\ branch line from Washington to Laurel, 14 miles, is nowbeing operated by direct-current, and will l>e taken over by theWashington, Baltimore & Annapolis company. Current fur this huewill be furnished by two Westinghouse aoo-kvv., 550-volt, 500 r. single-phase rotary converters located in the power house at1 lyattsville. This apparatus is also a new departure, especially sinceit shows the possibility of operating the new system with the exist-ing direct current equipments, which are to be -( ; I I, .\ii.\: ||.,\.\i. ; with the primary and secondary windings on separate cores, avoidsIhc difficulties of the direct-current controller, being entirely non->parkinK, and is adapted to handling very heavy currents. As a frequency of 2,000 alternations per minute is used, thelighting of the cars and sub-stations was at first considered a seriousdifficulty. Ihis is overcome by the use of very low-voltage lamps,allowing the use of a thick filament with considerable heat inertia. Westinghouse multiple-unit control and air brakes will be used,the air compressor iKring driven by a small altcrnaling-cnrreiil scriesmotor. Ihe grnrratiiig slalinn, now imder construrlion at llyaltsvillc. PORTABLE CONCRETE MIXING PLANT. Ihc accuiupanying illuslralions were finiiislied by the Mr. John Kerwin. superinlendent of tracks of the Detroit UnitedHy. Co., and show a construction train especially designed for plac-ing concrete oit street r
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
