Abstract: A sock for a tie of ballastless rail track that is to be held in a bed of concrete, the sock comprising firstly an elastically deformable case receiving the tie whose bottom edge is chamfered, and secondly a pad lying beneath the tie in the bottom of the case, wherein the bottom portion of the case includes, in its inside wall, recesses guaranteeing compression flexibility thereto even after the wall has been deformed under the effect of hydrostatic pressure from the concrete bed.

Abstract: The invention relates to a device for supporting and wedging a railway rail (R) on a tie (T), the device comprising in particular a resilient pad (1) on which there rests the base (Ra) of the rail (R) and two insulating tabs (2, 2') interposed between the rail (R) and spring clips (A, A') which are fixed on inserts (I, I') secured laterally in the tie (T).According to the invention, said pad (1) comprises a central portion (10) supporting the base (Ra) of the rail (R) and two symmetrical lateral portions (11, 11') of smaller thickness disposed beneath the bottom edges of the tabs (2, 2') which are themselves situated at a level lower than the base (Ra) of the rail (R).

Abstract: Rail support device for unballasted railway track comprising at least one concrete block resting on a flexible base, the assembly being held in an elastomeric shell which is anchored in a bed or mortar covering the lower part of said block, and which has a beading around its top edge. The horizontal cross section of said block is variable and has a maximum area at the level immediately below the beading on the upper edge of the shell so as to limit the relative movement of the block and the shell by means of an elastic force.

Abstract: The invention relates to a metal torsion bar for vehicle suspension, including a straight central part which has a circular cross-section, the central part extending longitudinally between two fixing heads suitable for being rigidly fixed to other mechanical members, the torsion bar being work-hardened by pretwisting and at least the central part of the torsion bar having an annular cross-section. According to the invention, the cross-section of the central part has a radially outside plasticized zone, which has been deformed plastically by the pretwisting, and a radially inside elastic zone, which has been deformed elastically by the pretwisting, the cross-section of the central part of the torsion bar having a total area S and the plasticized zone having an area Sp such that their ratio Sp/S is at least equal to 0.5 and at most equal to 0.6.

Abstract: This invention relates to an insert for fixation of a railway clip comprising an inner conduit, parallel to the rail, intended to receive the rectilinear central portion of the clip, a horizontal rear face on which abuts the rear portion, parallel to the rail, of the clip which is joined to the central portion by a 180.degree. bend and which then extends towards the rail, above the inner conduit, by a substantially perpendicular loop whose end comes into abutment on an insulating stop resting on the base of the rail, wherein the upper face of the insert comprises, towards the inlet orifice of the inner conduit, a retaining boss against which the loop of the clip comes into bearing contact to maintain the clip in a position of equilibrium, where the free end of the central portion is placed in the inlet orifice of the inner conduit.

Abstract: A tool for installing a spring rail fastener includes a main arm whose bottom end is provided with a toe adapted to fit over one of the angled axial ends of the fastener. The main arm is connected near its bottom end, above its toe and by way of a hinge having a transverse pin, to a secondary arm. The secondary arm includes a short first length adapted to be inserted into the housing of an anchoring insert, a second length forming a U-shape bent through 180.degree., a third length that is substantially parallel to the first length and on which the hinge is mounted, and a fourth length extending outwardly and downwardly in inclined manner relative to the third length and terminating in a curved zone.