Title: Process and apparatus for truing the head of rails of a railway

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Abstract: A process and apparatus for on-track truing of the surfaces of the head of a rail in which a predetermined number of grinding tools are positioned with respect to the rail to operate along a tangent to the profile of the head of the rail, the tools being suspended by jacks from a vehicle which travels along the rail and carries the tools therewith. The metal-removing ability of at least one of the grinding tools is directly or indirectly controlled by means of a set control value which is pre-established as a function of the desired cutting depth of the tool. In a particular arrangement, the hydraulic feed circuit supplying the tool contains a pressure regulating device with a control member for setting the pre-established value so that the jack will keep the tool in bearing pressure with the rail at a constant value while the tool is driven at a constant speed and with constant driving torque.


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