a ceiling frame 50 this ceiling frame 50 is part of the car body 1 and is used inter alia to stabilize the car body the interior of the car body 1 is indicated in fig3 by the reference letter i the car body 1 has a plurality of wall elements which serve as perpendicular car walls 7 8 the wall elements can be fastened for example internally or externally to the ceiling frame 50 depending on the embodiment as indicated with reference to the front wall 8 the car body 1 further comprises at least one car door leaf 10 1 which is arranged in the region of the front face of the car body containing the car doors the car door leaf 10 1 is suspended from a carriage 15 having guide rollers 12 a door guide rail 2 serves to guide the guide rollers 12 of the carriage 15 of the car door leaf 10 1 and therefore to guide the entire car door leaf the door guide rail 2 is arranged on the vertical front face 56 of the ceiling frame 50 and is fastened directly to the ceiling frame 50 via at least one spacer 9 such a spacer could be.