This one looks like a rule instruction car.
CN Train crews have to write the rules every 2 years and also pass a medical.
Some CN rule instructors actually lived in the car and the car would be parked at different terminals on the system every so often. Maybe just for a few days and then the car would move on. IN some cases this would save crew members driving hundreds of miles to write the rules in a big terminal like Toronto.
Most rules instructors came up through the ranks and were pretty good guys.
