Russ Bellinis said:
I'm not sure how the passenger cars were lighted in the steam era.
Russ, during the late steam era, most passenger cars had electric lighting, which was powered by an axle-driven generator when the car was moving, or by large batteries, which were hung beneath the car, when the car was standing. Many older head-end cars, at least on the CNR, were lit by Pintsch gas, which was carried in tanks beneath the cars. Such cars as were remaining in the late steam era were never converted to electric.
In this photo, the large box with the three access doors is a battery box, as is the smaller box at the bottom, to the left end of the upper box. At the left edge of the photo is a generator (the round thingy mounted at right angles to the centre sill, with its drive shaft extending over the centre sill) The drive belt extends off the shaft and out of the picture to the left. The shaft extending from the truck on the right end is a driveshaft for the Pullman drive, which provides power for the air conditioning compressor, which is the large box at lower right. There are two belts run by this system.
Here's the same car viewed from the opposite side, with the generator and belt at the right of the photo, and the air conditioning compressor and small battery box to the left of the centre of the picture:
Below is a view of the underside of a car lit by Pintsch gas: the gas would be charged into the two long tanks near the left end of the car, and distributed through a regulator and piping to the various fixtures inside the car. This type of lighting was supposedly much safer than the previously used acetylene lighting, and before that, oil lamps.
Wayne