Abstract: A method for the contactless detection of a position of a measurement device that can be moved by a rail running gear on a track relative to at least one rail of the track. A projection of a laser beam that is projected onto the at least one rail and onto the inner side of a wheel of the rail running gear is detected by way of a camera. A detected position of the measurement device with respect to the wheel inner side is evaluated by an evaluation device. The inner side of the wheel disc is used as a reference base for determining at least one position value of the measurement device.

Abstract: The invention relates to a machine for compacting a ballast bed of a track with a machine frame supported on rail-based running gears and a height-adjustable stabilising unit connected thereto, comprising a vibration drive and an axle with wheel flange rollers movable on rails of the track, whose distance to each other extending perpendicularly to the longitudinal direction of the machine can be varied by means of a spreading drive, as well as a roller clamp that can be pressed against the rails by means of clamping drives. The spreading drive and/or the clamping drives are set up to apply a predefined variable horizontal load force to the rails, whereby a measuring device is arranged to detect a rail head deflection and/or track gauge change caused by the variable load force. In this way, it can be determined by means of the stabilising unit whether the track panel is intrinsically stable.

Abstract: A method for determining an actual geometry of a track by a track inspection vehicle which is movable on the track, wherein reference points positioned in a lateral environment of the track are automatically recorded by a non-contacting recording system arranged on the track inspection vehicle and their respective actual distance from the track is determined. A three-dimensional trajectory of the track is recorded by an inertial measuring system arranged on the track inspection vehicle, wherein the trajectory is divided by a computing unit into trajectory sections each having a section starting point related to a first reference point and a section end point related to a second reference point, wherein a virtual longitudinal chord is defined for each trajectory section in relation to the assigned reference points, and wherein actual distances between the trajectory and the respectively defined longitudinal chord are calculated for each trajectory section.

Abstract: A method for determining an actual geometry of a track by a track inspection vehicle which is movable on the track, wherein reference points positioned in a lateral environment of the track are automatically recorded by a non-contacting recording system arranged on the track inspection vehicle and their respective actual distance from the track is determined. A three-dimensional trajectory of the track is recorded by an inertial measuring system arranged on the track inspection vehicle, wherein the trajectory is divided by a computing unit into trajectory sections each having a section starting point related to a first reference point and a section end point related to a second reference point, wherein a virtual longitudinal chord is defined for each trajectory section in relation to the assigned reference points, and wherein actual distances between the trajectory and the respectively defined longitudinal chord are calculated for each trajectory section.