Abstract: A machine for truing the bearing surface of the rails of a railroad track which is movable over the rails to be trued comprising a frame on which is mounted a train of grinding elements to be driven one behind the other over and along the rails tangentially of the bearing surface to remove irregularities. The machine is characterized in that at least one of the grinding elements can be displaced in a direction toward or away from the bearing surface of the rail to be trued to reach a desired position and can be locked into this desired position.

Abstract: A process and a system for measuring and recording undulatory deformations of a rail surface. A feeling device is moved along the rail surface and an accelerometer is connected to the feeling device to generate a voltage signal representative of the acceleration encountered by the feeling device in contact with the deformations. The signal is amplified and filtered in function of the speed of the vehicle carrying the system, and thereafter twice integrated, then rectified and amplitude-modulated in function of the vehicle speed. A filter eliminates spurious signals from the modulated signal and a recording of the lastly filtered signal is effected. In addition, there is also provided a circuit for measuring and recording sound signals generated by the rolling vehicle.

Abstract: A series of abrading contact elements for truing the bearing surface of a railway track, in which the abrading elements are moved one behind the other tangentially of the bearing surface of the rail to be abraded or ground. The elements are arranged in the form of two groups of two elements. One of the elements move away from the rail when the other moves towards the rail. Each of the two groups is mounted in one inclinable beam which are interconnected so that a change in the inclination of one of the beams causes a change in the inclination of the other beam. The elements of the two groups are always tangential to the radius of curvature of the rail including positive and negative radii, and a straight line. Each beam is rotatably mounted about its central point between two grinders of the respective group, and the adjacent ends of the beams are linked by means of crossed rods of equal length so that one beam tilts in one direction, the other beam tilts in the opposite direction.