. Electric railway journal . locomotives are by far the most powerfulever built. The locomotive is an articulated machine of doublecab design. Each half carries its own motor and completeequipment and the two halves are coupled together at theirdriving-wheel ends. The frames, driving wheels and trucks ofthe running gear are similar in general character to those ofthe American Type steam locomotive. The coupled ends arefitted with permanent couplings of twin drawbars and frictiondraft gears, so arranged that the leading half serves as a leadingtruck and the other half as a trailer in whichever
. Electric railway journal . locomotives are by far the most powerfulever built. The locomotive is an articulated machine of doublecab design. Each half carries its own motor and completeequipment and the two halves are coupled together at theirdriving-wheel ends. The frames, driving wheels and trucks ofthe running gear are similar in general character to those ofthe American Type steam locomotive. The coupled ends arefitted with permanent couplings of twin drawbars and frictiondraft gears, so arranged that the leading half serves as a leadingtruck and the other half as a trailer in whichever direction thelocomotive may be moving. Each cab is complete with auto-matic and straight air brake equipment, apparatus for trainlighting, electric headlights, pneumatically operated whistle andsanders, as well as its motor, unit switches and master con-troller. The machines are so arranged that if one motor is cutout the entire machine can be operated from either cab withthe remaining motor. The halves are Motors and Running Gear of Pennsylvania Locomotive The unit switch field control permits two or more locomotivesto be coupled together and all to be operated from either endof any one cab, and affords flexibility of speed regulation. Itgives two additional running notches and at the same timeeconomizes power consumption during acceleration. The following are some of the characteristic features ofthese direct-current, 600-volt electric locomotives: Weight of locomotive, complete 156 tons. Weight on drivers 200,000 lb. Weight on each driving axle 50,000 lb. Weight on each boo-ie truck lb. Total length over all. inside knuckles 64 ft. 11 in. Rigid wheel base of each half 7 ft. 2 in. Total wheel base of each half 23 ft. 1 Total wheel base of locomotive 55 ft. 11 Diameter of 72 in. Contract tractive effort 60,000 lb. Maximum draw-bar pull (recorded on test) 79,000 lb. Normal speed with full train 60 550-ton train to be started
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