Abstract: A welding unit for welding two rails of a track is equipped with clamping jaws intended for lying against a rail web. The clamping jaws each have a sliding surface, which is at a distance from a contact surface in the transverse direction of the rail and is arcuately curved with respect to a cross section extending such that it is normal to a neutral axis of the rails. The jaw mount, intended for fixing the clamping jaw, has a sliding surface, which is curved in a way corresponding to the sliding surface of the clamping jaw, and so the clamping jaw is movable along the sliding surfaces in relation to the jaw mount.

Abstract: For the purpose of rehabilitation, a ballast bed of a track is taken up in the form of an upper bed layer by a first clearing device and cleaned. The bulk material accruing in the process is discharged in front of the first clearing device—with regard to the working direction—laterally upon the ballast bed in a bed region. The latter can only be covered by the second clearing device which is configured to be of greater width—with regard to a transverse direction of the track—than the first clearing device. Thus, it is possible to intermediately store bulk material, accruing in a front end region of a machine, on the ballast bed for later use.

Abstract: A track maintenance vehicle (1) has a covered loading space (12) resting on a machine frame (2) and a crane jib (16) pivotable by means of drives. A loading wall (20), connected to the machine frame (2) and provided for intermediate storage of goods (19) situated in the loading space (12), is adjustable into a horizontal working position (22) adjoining the loading space (12) laterally, with respect to the transverse direction of the vehicle.

Abstract: Measurement of a track position is carried out in successive measurement sections (15), wherein the relative track position is registered in each case with the aid of a long chord (17), formed by a laser beam (16), which serves as reference line of a measuring system (9). During this; an angle enclosed by the two long chords (17) of two successive measurement sections (15) is measured in order to thereby obtain a spatial curve reproducing the actual position of the track.

Abstract: A welding unit for welding rails of a track includes two unit bodies that can be moved in relation to each other by displacement cylinders along unit guides running parallel to the rails. The displacement cylinders are connected both to pull rods and to a crossbeam. Thus a simple design having high tensile forces is possible.

Abstract: A machine (1) for picking up and storing rail fastenings (2) of a track (3) includes two rail fastening pickup devices (9). Arranged between these and a rear on-track undercarriage (4)—with regard to a working direction (6)—is a crawler track (24). At each longitudinal side of the machine, two devices (29) for guiding rails (30) are provided which are adjustable by drives (28) relative to the machine frame (5) and arranged one following the other in the longitudinal direction of the machine.

Abstract: A tamping machine designed especially for tamping switch sections comprises two inner and two outer tamping units (13, 24). Each outer tamping unit (24) is designed to be pivotable about a pivot axis (26), extending in the longitudinal direction of the machine, relative to a guide block (25) connected for displacement to transverse guides (12) and to a transverse displacement drive (14), and is connected to a pivot drive (27). Thus, tamping tools (18) of the outer tamping unit (24) can be positioned at a maximum distance from a machine center (23) for extensive tamping of a branch rail.

Abstract: For the purpose of rehabilitation, a ballast bed of a track is taken up in the form of an upper bed layer by a first clearing device and cleaned. The bulk material accruing in the process is discharged in front of the first clearing device—with regard to the working direction—laterally upon the ballast bed in a bed region. The latter can only be covered by the second clearing device which is configured to be of greater width—with regard to a transverse direction of the track—than the first clearing device. Thus, it is possible to intermediately store bulk material, accruing in a front end region of a machine, on the ballast bed for later use.

Abstract: The compression of ballast for a rail track takes place after two-stage cleaning by a cleaning machine. For this purpose, cleaned ballast is dispensed and a first ballast layer is thereby formed. The rail track which is laid on the first ballast layer has lateral oscillations imparted to it by a front stabilization unit, and the first ballast layer is thereby compressed. The formation of a second ballast layer takes place by a second chute, which second ballast layer is subsequently compressed by a rear stabilization unit.

Abstract: Measurement of a track position is carried out in successive measurement sections (15), wherein the relative track position is registered in each case with the aid of a long chord (17), formed by a laser beam (16), which serves as reference line of a measuring system (9). During this; an angle enclosed by the two long chords (17) of two successive measurement sections (15) is measured in order to thereby obtain a spatial curve reproducing the actual position of the track.

Abstract: In a method of rehabilitating a ballast bed of a track by excavating contaminated ballast and conveying the excavated contaminated ballast by a first conveyor band unit to a screening unit for cleaning the excavated contaminated ballast, the ballast bed is rehabilitated selectively, in dependence on the degree of contamination of the ballast, in a first or second operating stage. The first operating stage comprises the steps of excavating an upper layer of the ballast by a first excavating device which precedes a second excavating device, in an operating direction, and conducting the excavated upper ballast layer to the first conveyor band unit while, at the same time, the remainder of the ballast is excavated by the second excavating device and is conducted to a second conveyor band unit for disposal.

Abstract: A machine (1) for picking up and storing rail fastenings (2) of a track (3) includes two rail fastening pickup devices (9). Arranged between these and a rear on-track undercarriage (4)—with regard to a working direction (6)—is a crawler track (24). At each longitudinal side of the machine, two devices (29) for guiding rails (30) are provided which are adjustable by drives (28) relative to the machine frame (5) and arranged one following the other in the longitudinal direction of the machine.

Abstract: A tamping unit (5) for simultaneously tamping three sleepers (6) of a track (3) comprises inner, central and outer tamping tools (12, 13). The pivot axis (17) of the inner tamping tool (12) is positioned lower, with respect to the pivot axis (17) of the central tamping tool (13), by a vertically extending distance (a). The longitudinal axes (18) of the two tamping tines (19) are positioned, with regard to the two pivot axes (17) of the inner and central tamping tool (12, 13), off-center and closer to the pivot axis (17) of the inner tamping tool (12). With this, it is possible to also tamp without problems sleepers having a small sleeper crib width.

Abstract: The invention relates to the replacement of old ties of a railway track by new ties. This aim can be achieved by spreading the two rails apart from each other. The reception of ballast gravel for producing a recess of ballast is carried out in a region below of the sleeper head of a ballast bed, which is located adjacent to the region of the old sleepers along their longitudinal axis. The received ballast gravel is temporarily stored and, once the new sleepers have been deposited, thrown off for the purpose of ballasting. In parallel and prior to the deposit of new sleepers, excess ballast gravel is ploughed in the recess of ballast so as to produce a leveled surface of ballast.

Abstract: For the controlled lowering of a track, a longitudinal inclination of the track is determined at a rear tracing point of a measuring system and stored. For a length reaching back at least 10 meters, a current vertical profile is formed, and a rear compensation straight line is calculated which is superimposed upon the vertical profile and renders a target track position. The rear tracing point is guided by calculation along the rear compensation straight line, so that a compensation value for the position of the measuring chord ensues at a middle tracing point positioned between the rear tracing point and a front tracing point.

Abstract: A method for cleaning ballast of a track comprising rails extending in a longitudinal direction is executed by means of a ballast cleaning machine having a machine frame supported on on-track undercarriages. The machine includes a cleaning chain with a chain cross member extending perpendicularly to the longitudinal direction. At the start of the cleaning process, an on-track undercarriage situated immediately ahead of the cleaning chain, with regard to a working direction of the ballast cleaning machine, is lifted off the track. The rails are severed, and the track is lifted, after which the chain cross member of the cleaning chain is positioned underneath the track. Finally, the on-track undercarriage is set down upon the track again.

Abstract: Hardened metal inserts are inserted in a tine plate of a tamping tine for tamping ballast of a railroad track. The cylindrical inserts have a boundary surface bordering on a side surface of the tine plate, thus forming a part thereof. Owing to that configuration, the abrasion resistance of the side surfaces can be improved.

Abstract: A machine for welding the rails of a track includes a rail pulling device that grips the rail ends and pulls them together so that they can be welded to one another. Two rail clamps provided for gripping the rails are fastened to the rail pulling device. The rail clamps are each vertically adjustable in their position relative to the rail pulling device by way of a respective adjustment drive in a direction extending perpendicularly to a pulling device plane formed by hydraulic drives of the rail pulling device. With this, the rails can be lifted from ties in a simple manner in order to enable the clamping members of the rail pulling device to grip the rails.

Abstract: A track renewal machine is equipped with a ballast conveyor band extending in the longitudinal direction and arranged between upper and lower tie transport units and between ballast receiving means and ballast distributing means. The ballast conveyor band has a discharge end positioned rearwardly of a device for laying new rails, in the operating direction. A device for spacing the new ties from each other is positioned rearwardly of the ballast conveyor band discharge end in the operating direction.

Abstract: In a method for efficiently removing a great number of damaged rail sections, after a first separating cut, the severed free rail ends are gripped by a rail pulling device connecting the rail ends to one another, and are pulled towards one another. The pulling force required for the pulling-together as well a current rail temperature are registered for calculation of that length of a replacement rail which is required for producing a desired rail tension. A second separating cut is carried out—with corresponding path measurement—spaced at a distance from the first separating cut as calculated on the basis of the selected length of the replacement rail.