coach car
Car with two rows of benches or seats for transporting passengers in the seated position.
vestibule door 
Sometimes sliding door on the threshold plate at the top of the steps, providing access to the car.
vestibule 
Entrance compartment of the car.
luggage rack 
Space at the entrance of the car for stowing large pieces of luggage.
adjustable seat 
Seat whose back can be changed from a sitting position to a reclining position.
center aisle 
Walkway between the two rows of benches or seats, for going from one end of the car to the other.