[jamoldover]

Here's a diagram of the car (inside and underbody), showing what all of the compartments are. The pages are taken from Amtrak's Equipment Data Manual from the late 1970's. Definitions of the abbreviations on the diagram are as follows:

Interior equipment:
BDR - Bedroom
ELE - Electric Locker
FHT - Floor Heat Thermostat
FHV - Floor Heat Valve
HB - Hand Brake
LK - Locker
OHU - Overhead Heat Unit
RMT - Roomette
SWB - Electric Switchboard
WC - Water Cooler

Underfloor equipment:
ALT - Alternator
APWS - Air Pressure Water System
CR - Charging Receptacle
D - Brake Control Valve
GEN - Generator
RV - Relay Valve
S.E. D.V. - Steam Ejector Dump Valve

The room opposite the bathroom would have been a compartment for the sleeping car attendant (porter) to work.

Note that this is from later in the car's life, when the trucks you've built had been replaced with outside swing hanger disc brake versions, but the interior arrangement would have stayed the same.

Joshua