instruction-car

from The Century Dictionary.

• noun A railroad-car arranged for the instruction and examination of engineers, firemen, and train-hands. It is fitted with a steam-boiler, heating apparatus, and working models of air-brakes, train-signals, and other train appliances.
• noun An electric car on a short track, in a car-barn, for the instruction of motormen in the control of electric cars, signaling, the rules of the road, etc.
• noun A working electric car used in technical schools for demonstrations and practice in the building and handling of electric cars.