. Electric railway journal . evel track canthus be obtained. The control circuits, lights and air compressors areoperated from a dynamotor when running on the 1200-volt trolley. In re-equipping the cars, General Electricstraight air brakes were installed with air compres-sors having a displacement of 25 cu. ft. of free air perminute. An aluminum-cell lightning arrester withelectrolyte for summer and winter service is installedin a suitable box on the roof of each car. There are nine lighting circuits, each wired for fivelamps in series. These lamps and the arc headlight areall controlled by a
. Electric railway journal . evel track canthus be obtained. The control circuits, lights and air compressors areoperated from a dynamotor when running on the 1200-volt trolley. In re-equipping the cars, General Electricstraight air brakes were installed with air compres-sors having a displacement of 25 cu. ft. of free air perminute. An aluminum-cell lightning arrester withelectrolyte for summer and winter service is installedin a suitable box on the roof of each car. There are nine lighting circuits, each wired for fivelamps in series. These lamps and the arc headlight areall controlled by a three-point switch in the motormanscab. In place of a headlight resistance the incandescentcircuits are thrown in series with the arc lamp. Eachcar carries a standard No. 8 U. S. wheel trolley at eachend and also a sliding pantograph for collection of cur-rent from the catenary construction used on the privateright-of-way. The installation of the apparatus on the cars is anunusually good example of car equipment, and several. Pittsburgh & Butler Street Railway—Gibson Substation features deserve special mention. All wiring is in con-duit, and every conduit is a straight pipe, which sim-plifies the pulling in of wires and cables. Special cast-iron outlet boxes are suspended directly over theresistance grids, and the grids themselves are carefullyinsulated to prevent damage from snow. The motorleads are also well protected from injury by use ofcast-iron terminal boxes on the car and special woodenterminal blocks on the motor case. Each lead is cov-ered with rubber hose armored with brass wire, and theoutlet box is placed near the center of the bolster toobtain maximum flexibility. Hangers and boxes, andin fact all accessories, are interchangeable on all cars. Among the changes made in the cars to adapt themto direct-current operation the roof covering waschanged. With the single-phase equipment a groundedcopper sheathing was used on the car roof to grounda broken trolley wire. F
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