. Electric railway journal . rieswinding. The battery is automatically re-charged dur-ing the run. The operation of a Diesel-electric car thus is some-v/hat similar to that of a self-starter automobile, exceptthat there is a single control-lever, and a reversingswitch. During stops and while coasting, the supply offuel is cut off, which permits a considerable saving. Asthe engine delivers full output at normal speed, the carshows a very high efficiency in the ratio of fuel to ton-miles. For this 75 hp. type of car, the fuel consumption(Texas oil) runs about grams per ton-mie for 80-tontrai
. Electric railway journal . rieswinding. The battery is automatically re-charged dur-ing the run. The operation of a Diesel-electric car thus is some-v/hat similar to that of a self-starter automobile, exceptthat there is a single control-lever, and a reversingswitch. During stops and while coasting, the supply offuel is cut off, which permits a considerable saving. Asthe engine delivers full output at normal speed, the carshows a very high efficiency in the ratio of fuel to ton-miles. For this 75 hp. type of car, the fuel consumption(Texas oil) runs about grams per ton-mie for 80-tontrains, up to double that for trains of 30 tons corresponds to about 43 ton-miles per pound of other words, a 50-ton train would run something likeeight miles per gallon. The conclusion ref^ched by theauthor is that the results of these experiments indicatethat the Diesel-electric cars may have a future wheretraffic conditions will not justify a full electrification. 428 Electric Railway Journal Vol. 55, No. 9. THIS fHASSrS IS EQUIPPED WITH PONY TRUCK, FLANGED WHEELS AND TURNTABLE FOR OPERATION ON STANDARD GAGE RAILWAY TRACK New Gasoline Motor Car forHetch Hetchy Railroad Automobile Trucks Replace Steam Equipment inMountainous Territory Leading to San Fran-ciscos New Water Supply System ^ THE city of San Francisco operates a 69-mi!e rail-way extending from a junction with the SierraRailway to the site of the Hetch Hetchy dam, whichis being built as part of the citys water supply road is all in mountainous territory, has grades upto 4 per cent and a maximum curvature of 30 geared steam locomotives are used for han-dling most of the freight, automobile trucks andremodeled touring cars render important service. Thecity engineers office reports, the operation of thisclass of equipment has been extreme^ satisfactory andvery much more economical than steam equipment couldpossibly be in the kind of service for which it is used.
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