A rail system for a vehicle includes a floor rail integratable into or onto the floor, first elongate movement rail elements, second elongate movement rail elements, holding devices to hold the movement rail elements on the floor rail, and gliders supportable on the movement rail elements in a gliding manner. The movement rail elements have a rail profile cross-section perpendicular to their main extension axis; the cross-section has an undercut that faces laterally outwards. The movement rail elements each have two opposed end faces, which can be brought into contact with end faces of other movement rail elements, such that at least one continuous movement rail with a constant rail profile cross-section is created. The gliders include a recess corresponding to the rail profile cross-section for gliding support.