. Electric railway journal . orts indicate that for modern motors the inspec-tion cost is from 50 to 75 per cent and the main-tenance cost 25 per cent of that of the old the economies obtained with modern typemotors are sufficient, in some services, to justifythe replacement of many old motors which are stillin good operating condition. Table —VIII Comparison of Low-Floor and Old-Sttle Motors Motor Rating: 600 volts 500 volts Clearance, underneath: 30-in. wheels 24-in. wheels Speed (500 v. 58 amperes). Diameter of armature Number of slots Turns per coil Length of commutator Thicknes
. Electric railway journal . orts indicate that for modern motors the inspec-tion cost is from 50 to 75 per cent and the main-tenance cost 25 per cent of that of the old the economies obtained with modern typemotors are sufficient, in some services, to justifythe replacement of many old motors which are stillin good operating condition. Table —VIII Comparison of Low-Floor and Old-Sttle Motors Motor Rating: 600 volts 500 volts Clearance, underneath: 30-in. wheels 24-in. wheels Speed (500 v. 58 amperes). Diameter of armature Number of slots Turns per coil Length of commutator Thickness of shell Diameter of armature with gears and case. Low Floor Type 35 hp. 3A 3 2% g in. 2M lb. Old-Style Standard 3530 610 in. 29 3 3 in. 234 lb. Automobile motors.^Storage battery car. One of the Five Double-Deck Cars Operated by the Pittsburgh Railways in Service Where Heavy Traffic Is Handled from a Few Loading Points. In Cleveland the Adoption of the Skip-Stop Plan of Operation Has Permitted the Use of the Trail Car Without Reducing Schedule Speed Control Systems and Wiringfor Railway Motors Developments in control for recent high-speed cars have been largely simplification of the indirectly-con-trolled unit-switch apparatus. For city service this system has proved less desirable than the directly-op-erated platform controller, which, however, is now frequently modified by combination with a contactorto break main circuits beneath the car floor, and to permit door and control interlocking. Another re-cent innovation in control for four-motor equipments practically eliminates the rheostat and its losses. CONTROL systems for modern electric rail-way cars may be classified as direct and in-direct, this division being based on themethod used in performing the switching. Bothuse the series-parallel method of adjusting thevoltage, wherein the motors, or groups of motors,are arr
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