A rail vehicle, comprising - at least one apron flap (11, 12, 16, 17; 30, 60) with a first downwardly extending side edge (22a, 23a) and a second downwardly extending side edge (22b, 23b), which is attached by way of at least one adjustment device (18a, 18b, 19a, 19b, 20a, 20b, 21a, 21b; 31a, 31b; 61a, 61b) in a movable manner to a car body or undercarriage (13; 33) of the rail vehicle, wherein the at least one adjustment device (18a, 18b, 19a, 19b, 20a, 20b, 21a, 21b; 31a, 31b; 61a, 61b) is designed in such a way that pressure applied on the inside of the apron flap (11, 12, 16, 17; 30; 60) results in moving the apron flap from its initial position outwardly to an extended position, wherein in the extended position at least the first side edge (22a, 23a) is exposed and is parallel or essentially parallel to the side wall (24a, 24b) of the car body, and the adjustment device comprises a spring element (50; 65a, 65b, 65c), which is designed in such a way that it is tensioned by the movement of the apron flap (11, 12, 16, 17; 30, 60) to the extended position and with the removal of the pressure on the inside of the apron flap (11, 12, 16, 17; 30, 60) the apron flap returns to the initial position, - a chassis, which is rotatable around a vertical axis, wherein during a rotation around the vertical axis the chassis can touch the apron flap (11, 12, 16, 17; 30, 60), can apply pressure to the inside of the apron flap (11, 12, 16, 17; 30, 60) and can thus move the apron flap from its initial position to the extended position, characterized in that the chassis touches during the rotation the apron flap (11, 12, 16, 17; 30, 60) in a front section of the apron flap or in a rear section of the apron flap, and the second side edge (22b, 23b) in the extended position of the apron flap (11, 12, 16, 17; 30, 60) is not exposed or is less exposed than the first side edge (22a, 23a) such that the apron flap is diagonal to the side wall (24a, 24b). - at least one apron flap (11, 12, 16, 17; 30, 60) with a first downwardly extending side edge (22a, 23a) and a second downwardly extending side edge (22b, 23b), which is attached by way of at least one adjustment device (18a, 18b, 19a, 19b, 20a, 20b, 21a, 21b; 31a, 31b; 61a, 61b) in a movable manner to a car body or undercarriage (13; 33) of the rail vehicle, wherein the at least one adjustment device (18a, 18b, 19a, 19b, 20a, 20b, 21a, 21b; 31a, 31b; 61a, 61b) is designed in such a way that pressure applied on the inside of the apron flap (11, 12, 16, 17; 30; 60) results in moving the apron flap from its initial position outwardly to an extended position, wherein in the extended position at least the first side edge (22a, 23a) is exposed and is parallel or essentially parallel to the side wall (24a, 24b) of the car body, and the adjustment device comprises a spring element (50; 65a, 65b, 65c), which is designed in such a way that it is tensioned by the movement of the apron flap (11, 12, 16, 17; 30, 60) to the extended position and with the removal of the pressure on the inside of the apron flap (11, 12, 16, 17; 30, 60) the apron flap returns to the initial position, - a chassis, which is rotatable around a vertical axis, wherein during a rotation around the vertical axis the chassis can touch the apron flap (11, 12, 16, 17; 30, 60), can apply pressure to the inside of the apron flap (11, 12, 16, 17; 30, 60) and can thus move the apron flap from its initial position to the extended position,