A passageway between two carriages of a rail vehicle, in particular a high-speed rail vehicle, wherein the passageway comprises an inner bellows and, disposed at a distance to said, an outer bellows to form an interior space, wherein the two bellows are each attached to the end face of the vehicle, wherein the two bellows are each designed in their circumference in a box shape, and that the interior space contains a means for at least a partial pressure compensation.