Abstract: The present invention relates to a continuously advancing machine for works on a railway track, comprising a main chassis mounted on bogies and provided with a mobile chassis supported working members such as ballast tamping and track lifting/shifting units. The chassis may move along the main chassis under the action of a chain driven by a motor so as to advance, during the works, step by step with respect to the track while the machine progresses continuously. The reactions of inertia are compensated by a mobile counterweight coupled to the chain so as to execute movements parallel to those of the mobile chassis but in opposite direction, the respective quantities of movement of the counterweight and of the mobile chassis including the working members being equal and opposite.

Abstract: The invention relates to a continuously advancing machine for works on a railway track, comprising a main chassis mounted on bogies and provided with a mobile auxiliary chassis supporting working members such as ballast tamping and track lifting/shifting units. The auxiliary chassis may move along the main chassis under the action of a bar for attachment to a chain driven by a motor and borne by a carriage, so as to advance, during the works, step by step with respect to the track while the machine progresses continuously. The reactions of inertia are entirely taken up by the track, via the carriage immobilized thereon thanks to grippers during the phases of advance of the auxiliary chassis and its working units.