This car does not had built-in rear lights.
There was a time when they added red lights to the roof - that's why there are those holes in the corners.
AFAIK they later added the red lights at a lower level. Since this is a DB car, I guess the red lanterns should be beside the door. I don't know when exactly the position was changed - it was in the ’60s. So check the revision date of the car.
Lanterns on the roof show a white light in the forward direction and a red light to the rear end.