framing of wrought-iron
carlines and purlines. The sides of the cars are double and composed
of steel plates on the outside, riveted to the side posts and belt
rails, and lined with electrobestos. The outside roof is of fireproof
composite board, covered with canvas. The headlinings are of fireproof
composite, faced with aluminum sheets. The mouldings throughout are of
aluminum. The wainscoting is of "transite" board and aluminum, and the
end finish and window panels are of aluminum, lined with asbestos
felt. The seat frames are of steel throughout, as are also the cushion
frames. The sash is double, the lower part being stationary and the
upper part movable. The doors are of mahogany, and are of the sliding
type and are operated by the door operating device already described.

[Illustration: SIDE VIEW OF MOTOR TRUCK]

[Sidenote: _Trucks_]

Two types of trucks are being built, one for the motor end, the other
for the trailer end of the car. The following are the principal
dimensions of the trucks:

Motor Truck. Trailer Truck.

Gauge of track,............................. 4' 8-1/2" 4' 8-1/2"
Distance between backs of wheel flanges,.... 4' 5-3/8" 4' 5-3/8"
Height of truck center plate above rail,
car body loaded with 15,000 pounds,....... 30" 30"
Height of truck side bearings above rail,
car body loaded,.......................... 34" 34"
Wheel base of truck,........................ 6' 8" 5' 6"
Weight on center plate with car body
loaded, about............................. 27,000 lbs.
Side frames, wrought-iron forged,........... 2-1/2" x 4" 1-1/2" x 3"
Pedestals, wrought-iron forged,.........................
Center transom, steel channel,..........................
Truck bolster,.............................. cast steel. wood and iron.
Equalizing bars, wrought iron,..........................
Center plate, cast steel,...............................
Spring plank, wrought iron,................. 1" x 3" white oak.
Bolster springs, elliptic, length, ......... 30" 32"
Equalizing springs, double coil,
outside dimensions,................... 4-7/8" x 7-1/2" 3-5/8" x 6"
Wheels, cast steel spoke center,
steel tired, diameter,.................... 33-3/4" 30"
Tires, tread M. C. B. Standard,......... 2-5/8" x 5-1/4" 2-5/8" x 5-