A vehicle rail mounting device for mounting a vehicle rail on a rail support structure so that the vehicle rail extends in a rail longitudinal direction, the device including: a bottom piece adapted to be supported on the support structure; at least one elastomeric bearing element adapted to be supported over the bottom piece and defining at least one elastomeric element end recess; at least one top cover element having at least one top cover connector adapted to enable releasable connection of the at least one top cover element to the bottom piece and the support structure so as to secure the at least one top cover element relative to the support structure and to the bottom piece, the or each of the at least one top cover element having at least one elastomeric element retainer which is adapted, when the at least one top cover element is releasably connected to the bottom piece and the support structure, to prevent removal of the at least one elastomeric bearing element, from the bottom piece; a top piece having top piece ends (20.1); and at least one rail connector being an integral part of, or fixable to, the top piece, wherein the top piece is inter-engaged with the at least one elastomeric bearing element, the vehicle rail mounting device being characterized in that the top piece is restrained by the at least one elastomeric bearing element by means only of the top piece ends (20.1) being held captive in the at least one elastomeric element end recess such that, when the at least one elastomeric bearing element is prevented by the at least one elastomeric element retainer from being removed relative to the bottom piece, the top piece is prevented by the at least one elastomeric bearing element from being removed relative to the bottom piece; and the or each of the at least one top cover element includes first top cover element locking formations and the bottom piece includes first bottom piece locking formations, wherein the at least one top cover element, the top piece, and the at least one elastomeric element together form at least part of a top cover assembly which is adapted to be moveable relative to the bottom piece between a first relative position in which the first top cover element locking formations are separated from the first bottom piece locking formations, and a second relative position in which the first top cover element locking formations are engaged with the first bottom piece locking formations, wherein, when the top cover assembly is in the first relative position, the top cover assembly is adapted to be moveable in a direction transverse to the rail longitudinal direction, relative to the bottom piece, and when the top cover assembly is in the second relative position, the first top cover element locking formations are adapted to prevent said movement in said transverse direction by said engagement with the first bottom piece locking formations. a bottom piece adapted to be supported on the support structure; at least one elastomeric bearing element adapted to be supported over the bottom piece and defining at least one elastomeric element end recess; at least one top cover element having at least one top cover connector adapted to enable releasable connection of the at least one top cover element to the bottom piece and the support structure so as to secure the at least one top cover element relative to the support structure and to the bottom piece, the or each of the at least one top cover element having at least one elastomeric element retainer which is adapted, when the at least one top cover element is releasably connected to the bottom piece and the support structure, to prevent removal of the at least one elastomeric bearing element, from the bottom piece; a top piece having top piece ends (20.1); and at least one rail connector being an integral part of, or fixable to, the top piece, wherein the top piece is inter-engaged with the at least one elastomeric bearing element, the vehicle rail mounting device being characterized in that the top piece is restrained by the at least one elastomeric bearing element by means only of the top piece ends (20.1) being held captive in the at least one elastomeric element end recess such that, when the at least one elastomeric bearing element is prevented by the at least one elastomeric element retainer from being removed relative to the bottom piece, the top piece is prevented by the at least one elastomeric bearing element from being removed relative to the bottom piece; and the or each of the at least one top cover element includes first top cover element locking formations and the bottom piece includes first bottom piece locking formations, wherein the at least one top cover element, the top piece, and the at least one elastomeric element together form at least part of a top cover assembly which is adapted to be moveable relative to the bottom piece between a first relative position in which the first top cover element locking formations are separated from the first bottom piece locking formations, and a second relative position in which the first top cover element locking formations are engaged with the first bottom piece locking formations, wherein, when the top cover assembly is in the first relative position, the top cover assembly is adapted to be moveable in a direction transverse to the rail longitudinal direction, relative to the bottom piece, and when the top cover assembly is in the second relative position, the first top cover element locking formations are adapted to prevent said movement in said transverse direction by said engagement with the first bottom piece locking formations.