A welding head for welding the extremities of two sections of rail and comprises two half-heads (10) aligned and sliding with regard to one another in a longitudinal direction. Each half-head comprises grip mechanism (12, 13) for grasping a respective section of rail and two electrodes (16) suitable for contact with respective sections of rail in order to carry out a flash butt weld. The head also comprises traction actuator mechanisms (20) which extend in a longitudinal direction and are connected to the two half-heads (10) to shift the two half-heads in a longitudinal direction one towards the other, the traction actuator mechanism (20) having a stroke suitable for allowing, during a cycle of welding two sections of rail, simultaneous regulation of rail tensions.

A rail alignment tool for aligning a rail segment of a railroad track positioned on a plurality of railroad ties is provided. The rail alignment tool includes a first side member and a second side member. The first side member includes first and second adjustment arms, and a first connecting member between the adjustment arms. The adjustment arms are positioned on opposite sides of a railroad tie. The second side member receives the adjustment arms and includes a second connecting member. At least one of the side members includes a first adjustment member that extends from the first and/or second connecting members in a first direction substantially perpendicular to a longitudinal axis of the rail segment. The adjustment arms engage a bottom surface of the rail segment and move the rail segment away from the railroad tie when the first adjustment member is extended.

A rail alignment tool for aligning a rail segment of a railroad track positioned on a plurality of railroad ties is provided. The rail alignment tool includes a first side member and a second side member. The first side member includes first and second adjustment arms, and a first connecting member between the adjustment arms. The adjustment arms are positioned on opposite sides of a railroad tie. The second side member receives the adjustment arms and includes a second connecting member. At least one of the side members includes a first adjustment member that extends from the first and/or second connecting members in a first direction substantially perpendicular to a longitudinal axis of the rail segment. The adjustment arms engage a bottom surface of the rail segment and move the rail segment away from the railroad tie when the first adjustment member is extended.

A welding unit for connecting two rails of a track by flash-butt welding, includes clamping jaws having contact surfaces intended for application to a rail web and a power jaw for current transmission having a contact surface for application to the rail web. The power jaw is displaceable relative to the clamping jaw in a pressing direction leading to contact with the rail. In an inoperative position spaced from the rail web, the power jaw, due to the pressure of a pressure spring, is situated in a forward end position with regard to the pressing direction, in which the contact surface of the power jaw projects beyond the contact surface of the clamping jaw.

A welding unit for connecting two rails of a track by flash-butt welding, includes clamping jaws having contact surfaces intended for application to a rail web and a power jaw for current transmission having a contact surface for application to the rail web. The power jaw is displaceable relative to the clamping jaw in a pressing direction leading to contact with the rail. In an inoperative position spaced from the rail web, the power jaw, due to the pressure of a pressure spring, is situated in a forward end position with regard to the pressing direction, in which the contact surface of the power jaw projects beyond the contact surface of the clamping jaw.

The invention refers to a fish plate clamp (10) for unloading rails (1), that comprises a support element (11, 12) that comprises a first piece (11) and a second piece (12) each one located on a face of the rail (1), characterized in that: each piece of the support element (11, 12) comprises an internal mortise (13) in the area of the web (3) of the rail (1), a gripping element (14) of the rail (1) located in an internal mortise (13) of the support element (11, 12),
where the internal mortises (13) comprise an inclined surface (15) in a manner that when the gripping element (14) moves along the length of the inclined surface (15) of the internal mortise (13) in the direction of the pull of the rail (1) the gripping element (14) latches onto the web (3) of the rail (1).

The invention refers to a fish plate clamp (10) for unloading rails (1), that comprises a support element (11, 12) that comprises a first piece (11) and a second piece (12) each one located on a face of the rail (1), characterized in that: each piece of the support element (11, 12) comprises an internal mortise (13) in the area of the web (3) of the rail (1), a gripping element (14) of the rail (1) located in an internal mortise (13) of the support element (11, 12),
where the internal mortises (13) comprise an inclined surface (15) in a manner that when the gripping element (14) moves along the length of the inclined surface (15) of the internal mortise (13) in the direction of the pull of the rail (1) the gripping element (14) latches onto the web (3) of the rail (1).

A procedure for laying railway tracks on a trackbed on which sleepers (20) are located, that comprises at least the following steps: a) approach of a track laying train (30) with the stretches of rail (1) to be laid in the laying area; b) joining of the pairs of rails (1) to the consecutive rails (1) by means of tractor plates (200); c) unloading the pairs of rails (1) from the track laying train (30) onto the bed; d) squaring of the sleepers (20) by means of a squaring device; e) joining of the consecutive pairs of rails (1) by means of a joint plate (100); f) unloading of ballast in hoppers onto the bed; g) tamping of the rails (1); h) profiling of the ballast by means of a profiling device (400); i) welding of the rails (1).

A procedure for laying railway tracks on a trackbed on which sleepers (20) are located, that comprises at least the following steps: a) approach of a track laying train (30) with the stretches of rail (1) to be laid in the laying area; b) joining of the pairs of rails (1) to the consecutive rails (1) by means of tractor plates (200); c) unloading the pairs of rails (1) from the track laying train (30) onto the bed; d) squaring of the sleepers (20) by means of a squaring device; e) joining of the consecutive pairs of rails (1) by means of a joint plate (100); f) unloading of ballast in hoppers onto the bed; g) tamping of the rails (1); h) profiling of the ballast by means of a profiling device (400); i) welding of the rails (1).

A welding unit for welding rails of a track includes a first sub-unit which is displaceable on unit guides in a rail longitudinal direction relative to a second sub-unit by using displacement cylinders. Each sub-unit includes clamping cylinders disposed underneath the unit guides and coupled to clamping jaws for clamping the rails. The two sub-units are connected by the displacement cylinders in that a cylinder body of the respective displacement cylinder is connected to one sub-unit and a piston rod of the respective displacement cylinder is connected to the other sub-unit. Thus, it is not necessary to support the displacement cylinders relative to a transverse beam disposed at the front.