. Electric railway journal . axles is mounted the anaintransformer, of 650-kva. hourly rating. It is of theair blast type. About one-sixth of the transformer out-put is required for train heating. A 15-kw. fan pro-vides forced circulation for transformer and motor. Onthe other side of the motor, and above the second axle,is located an air compressor for operation of brakes, oilswitch, pantagraph and rail sanders. Nine taps on thelow-voltage winding of the transformer, two choke coilsand two small resistors provide for twelve positions ofthe controller. The wheelbase of the tractor is 9i ft., t
. Electric railway journal . axles is mounted the anaintransformer, of 650-kva. hourly rating. It is of theair blast type. About one-sixth of the transformer out-put is required for train heating. A 15-kw. fan pro-vides forced circulation for transformer and motor. Onthe other side of the motor, and above the second axle,is located an air compressor for operation of brakes, oilswitch, pantagraph and rail sanders. Nine taps on thelow-voltage winding of the transformer, two choke coilsand two small resistors provide for twelve positions ofthe controller. The wheelbase of the tractor is 9i ft., the wheeldiameter 4 ft. 5 in., the complete weight about 75,000 lb.,the unsprung load 11,500 lb., the maximum speed402 , the maximum speed of the motor 900 ,and the drawbar pull at the start 21,200 lb. The tractor or locomotive plan for operating rapidtransit trains in Berlin is, of course, highly experi-mental. It is doubtful if the rate of acceleration whichcan be produced with this arrangement is sufficient for. EXPERIMENTAL MULTIPLE UNIT TRAINS IN OPERATIONIN BERLIN DURING PAST FEW MONTHS local conditions. Another experiment which has beentried within the past few months is the use of motorcars and trailers, each motor car having an hourly rat-ing of about 350 hp. and weighing completely equippedabout 68 tons. The experimental train which has beenin successful operation during the past winter consistsof two motor cars and three trailers. A Small Single-Phase Locomotive for Useat Mare Island THE San Francisco, Napa & Calistoga Railway hasjust completed in its shops at Napa a 50-ton single-phase locomotive. It is to be used to handle govern-ment freight between the companys connection at NapaJunction with the Southern Pacific Company and thegovernments delivery yards at the Mare Island NavyYard. Mare Island was recently connected with themain land by a causeway built by the government andelectrified by the railway. This locomotive, which was built especially for th
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