A track measuring vehicle for recording a track geometry of a track includes a vehicle frame which has rail undercarriages and is mobile on two rails of a track. The vehicle also includes a first measuring base on which are arranged an inertial measuring unit and, for a position determination relative to each rail, at least one contact-less position measuring device. A lowerable second measuring base has measuring running wheels designed to be set upon the rails and is connected to the first measuring base via compensation measuring devices.

A track measuring vehicle for recording a track geometry of a track includes a vehicle frame which has rail undercarriages and is mobile on two rails of a track. The vehicle also includes a first measuring base on which are arranged an inertial measuring unit and, for a position determination relative to each rail, at least one contact-less position measuring device. A lowerable second measuring base has measuring running wheels designed to be set upon the rails and is connected to the first measuring base via compensation measuring devices.

A method detects vibrations transmitted in the area of a track, with the track being vibrated during a work process by a work unit of a track maintenance machine travelling along the track. The vibrations being transmitted via the track are measured by a sensor distanced from the work unit and with measuring data of the sensor being evaluated in an evaluation device. In that, a position of the sensor with respect to the work unit is given to the evaluation device, with a correlation between a vibration effect of the work unit detected with the sensor and a distance between the work unit and the sensor being calculated in the evaluation device. The method has the advantage that the vibration effect of the work unit can be detected in real time at the location of the sensor.

A method detects vibrations transmitted in the area of a track, with the track being vibrated during a work process by a work unit of a track maintenance machine travelling along the track. The vibrations being transmitted via the track are measured by a sensor distanced from the work unit and with measuring data of the sensor being evaluated in an evaluation device. In that, a position of the sensor with respect to the work unit is given to the evaluation device, with a correlation between a vibration effect of the work unit detected with the sensor and a distance between the work unit and the sensor being calculated in the evaluation device. The method has the advantage that the vibration effect of the work unit can be detected in real time at the location of the sensor.

The invention relates to a method for contactless recording of a track geometry of a track by means of a rail vehicle which is moved along the track on on-track undercarriages (4), wherein profile data of the track extending in transverse direction are compiled by means of a laser scanner. In this, it is provided that, by means of an evaluation device, profile data are evaluated relative to a reference base pre-defined on the rail vehicle in order to derive from this the course of a track central axis and/or a rail. The invention additionally relates to a rail vehicle which comprise an evaluation device configured for carrying out the method. Thus, no further measuring system is required to determine a track position.

The invention relates to a method for contactless recording of a track geometry of a track by means of a rail vehicle which is moved along the track on on-track undercarriages (4), wherein profile data of the track extending in transverse direction are compiled by means of a laser scanner. In this, it is provided that, by means of an evaluation device, profile data are evaluated relative to a reference base pre-defined on the rail vehicle in order to derive from this the course of a track central axis and/or a rail. The invention additionally relates to a rail vehicle which comprise an evaluation device configured for carrying out the method. Thus, no further measuring system is required to determine a track position.

A method for locating railroad components along a railroad track including obtaining a guidance plan and obtaining inspection data. The guidance plan includes an identity of each of a plurality of assets, the identity including previous features of the assets. The assets may be railroad components. The inspection data includes current features of a plurality of railroad components along the railroad track. The method includes using one or more processors, comparing and correlating the current features of the plurality of railroad components with the previous features of the assets to determine which of the plurality of railroad components corresponds with the plurality of assets.

A method for locating railroad components along a railroad track including obtaining a guidance plan and obtaining inspection data. The guidance plan includes an identity of each of a plurality of assets, the identity including previous features of the assets. The assets may be railroad components. The inspection data includes current features of a plurality of railroad components along the railroad track. The method includes using one or more processors, comparing and correlating the current features of the plurality of railroad components with the previous features of the assets to determine which of the plurality of railroad components corresponds with the plurality of assets.

The present disclosure discloses a monitoring device for internal deformation and fine particle loss of a railway subgrade, relating to the field of monitoring devices. The monitoring device includes an internal damage monitoring device arranged in a subgrade ballast layer. The internal damage monitoring device is connected to a resistance acquisition instrument through a wire. The resistance acquisition instrument is in wireless connection with a resistance signal receiver. The monitoring device for internal deformation and fine particle loss of a railway subgrade provided by the present disclosure can remotely realize real-time continuous monitoring of the deformation and fine particle loss inside the railway subgrade under a rail transit load, is economical and convenient, and has high practice value.

In a method of operating a tamping unit of a track maintenance machine, the track maintenance machine having the tamping unit is first provided on a track bed. The tamping unit is displaced relative to the track bed. A driving force, acting on the tamping unit and required for the displacement, and acceleration acting on the tamping unit are determined. A ballast force acting between the tamping unit and the track bed is determined by way of the driving force and the acceleration, and is evaluated.