Abstract: This machine comprises at least one grinding unit mounted to a grinding base. Each unit comprises a frame secured to the grinding base. The grinding wheel is driven by an electric motor, suspended from the frame by means of four rocker arms constituting two parallel-motion suspension systems. The lower rocker arms are levers of the first order and the grinding pressure is applied for one of the rocker arms by the piston rod of a hydraulic cylinder rigid with the frame and adapted to position the grinding wheel in relation to the rail, and for the other rocker arm by the piston rod of a pneumatic cylinder also rigid with the frame. This pneumatic cylinder determines the operating pressure of the grinding wheel on the rail. The operative face of the grinding wheel is parallel to the plane of the theoretical tangent to the rail profile. A right-angled lever is pivoted to a projection of the frame and provided at one end with a stud facing the grinding wheel.

Abstract: A railroad track relaying train has, in addition to the cars for transporting the ballast screening machines and a car equipped with power-wrenches for fixing the tie-screws, a sequence of working cars including a tie-and rail-removing car, a ballast clearing car, and a tie and rail laying car. These cars have bogie trucks at both ends and are interconnected by means of coupling frames adapted to bear the adjacent ends of the working cars in the trackless working area and supported by caterpillar trucks adapted to keep the working cars on the selected path, when moving on the ballast cleared track bed. Each caterpillar truck is provided with hydraulic cylinders for raising and lowering the coupling frame relative to the respective truck and with mechanisms for driving and steering the truck.

Abstract: A method for the improvement and drainage of a railway track employs a train comprising a working frame-car to carry out the method whereby it is made possible to dismantle and reassemble the track together with its infrastructure. The old track spans are removed, ballast and earth are excavated from the track and replaced by a layer of sand and by new ballast which are distributed, levelled and compacted mechanically. All these operations are taking place in succession through and within the empty frame of said frame-car as the latter is stationary bridging the working site. Two travelling gantries are provided on the train and equipped both with a lifting device for a track span and a lifting and tipping device for buckets. The working car is also equipped with means for excavating, digging, levelling and compacting.

Abstract: A rail road rail grinding truck adapted to grind the top surface of the rail comprises at least one grinding unit of which the position is adjustable by means of a cylinder and also of rail-engaging bearing shoes following the undulations of the rail surface. Each unit comprises an adjustable stop member responsive to a servo-action regulation device as a function of the grinding wheel wear and also of the rail undulations, so that the point of contact between the wheel and the rail cannot fall below the grinding base determined by the bearing shoes.

Abstract: A method for the improvement and drainage of a length of railway track employs a train to carry out the method whereby it is made possible to dismantle and reassemble the length of track together with its infrastructure. Ballast and earth are excavated from the track and replaced by a layer of sand which is distributed and compacted mechanically through an empty frame of a working truck of the train. Two travelling gantries are provided on the train and equipped both with a lifting device for a length of track and a lifting and tipping device for buckets. The working truck is also equipped with a strip for levelling a platform and a tamper. These two members are mounted on a common chassis supported by travelling on the two side parts of the empty frame of the working truck within the travelling supports for the gantries so that the levelling-tamping chassis may move freely by passing below the gantries.

Abstract: A railroad track relaying train comprises, in addition to the cars for transporting the ballast screening machines and a car equipped with power-wrenches for fixing the tie-screws, a sequence of working cars including a tie- and rail-removing car, a ballast clearing car, and a tie and rail laying car, these cars being interconnected by means of coupling frames supported by caterpillar trucks adapted to keep the working cars on the selected path. The tie and rail removing car comprises an elevator capable of lifting and rotating at least one tie or a track span around ballast conveyors, in order to deposit at least one tie or track span upon a transport element. The train is capable of performing all of the operations necessary for removing the old track, excavating and screening the old ballast, and laying the new track on the screened ballast, without stopping its forward motion when removing the old track.

Abstract: The complete renewal of a railway road track, i.e. clearing and screening the ballast, and substituting new ties and rails for the old ones, comprises a continuous sequence of operations forming repeating cycles consisting in removing the old track, clearing and screening the ballast, laying a new track with a single passage of a train comprising, in addition to the apparatus necessary for performing the operations, and to the cars necessary for transporting the rails, ties and hardware accessories, at least one track-laying and removing lift of trucks equipped with gantries and frame trucks.

Abstract: A train assembly for replacement of an old rail track by a new one with long rails comprises a permanently coupled train section including an open-frame wagon with rails carrying gantries for removal of track panels through the open frame and placing new cross-ties. The open-frame wagon has a bogie able to run on the track but retracted during operation and replaced by caterpillar tracks running on the ballast, or by rollers running on the new rails placed temporarily beside the track. The new rails are then brought together and fixed on the newly-placed cross-ties, so that the rear part of the train assembly runs on the new track whereas the front part runs on the old track.