. Electric railway journal . ell temperatures were taken bv E. J. Ross. Jr.,at different stages of the trip as follows: March 6: 8:50 —Grand Central Terminal, just previous to start 105deg. bahr. 10:25 —Poughkeepsie, average cell temperature. 100 deg. —Upper Hudson, previous to boost, deg4:30 —After boost of two hours at an average of 270 amp11U dep. 16:15 —Snringfield, previous to boost, deg10:50 —After boost of approximately one and three-quarter hoursat 248 amp, deg March 7: 3:45 —Boston, just previous to completion of trip. deg. ;68 ELECTRI
. Electric railway journal . ell temperatures were taken bv E. J. Ross. Jr.,at different stages of the trip as follows: March 6: 8:50 —Grand Central Terminal, just previous to start 105deg. bahr. 10:25 —Poughkeepsie, average cell temperature. 100 deg. —Upper Hudson, previous to boost, deg4:30 —After boost of two hours at an average of 270 amp11U dep. 16:15 —Snringfield, previous to boost, deg10:50 —After boost of approximately one and three-quarter hoursat 248 amp, deg March 7: 3:45 —Boston, just previous to completion of trip. deg. ;68 ELECTRIC RAILWAY JOURNAL [Vol. XLI, No. 17. ELECTRIC TRACTOR FOR SWITCHING SERVICE INCITY STREETS NEW CENTER-ENTRANCE COMBINATION CARS An extraordinarily powerful electric automobile has beenplaced in the service of the Pennsylvania Railroad at itsJersey City yards for moving freight cars through citystreets. It is intended for use where steam locomotives arenot available or desirable, and it is arranged to run on the. Storage Battery Tractor for City Switching Service ground, the 7-ft. gage of its wheels easily spanning thestandard track. The car can thus be maneuvered aroundan ordinary train, since its movement is not confined to therails. The wheels are 5 ft. in diameter and they haverubber block tires. A normal drawbar pull of 8000 lb. isdeveloped, which can be increased to a maximum of 21,500lb. if required. Running light, the trac-tor maintains a speed of about 6 milesper hour. Energy for the two 20-hp GeneralElectric motors is supplied by eightycells of Edison A-12-H storage battery,weighing 4350 lb. Herringbone gearsconnect the motors to the countershafts,a total reduction of 1 to 40 being ob-tained at the wheelshafts. The tractorutilizes all four wheels for driving,steering and braking. With this ar-rangement the car can be turned in acircle of 20-ft. radius. By means ofduplicate equipment in the cab the trac-tor can also be operated in either direc-tion from ei
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