Mobile track leveling, lining and tamping machine

A mobile track leveling, lining and tamping machine comprising a main machine frame supported on undercarriages spaced apart in the direction of the track for mobility on the track in an operating direction, the track consisting of two rails fastened to successive ties resting on ballast;

• an operating unit mounted for adjustment in relation to the main machine frame in the operating direction and comprised of a separate carrier frame means supporting a ballast tamping assembly and a track leveling and lining assembly forwardly of the ballast tamping assembly, in the operating direction, at a fixed distance from the tamping assembly;
• a pivotal bearing supporting a front end of the operating unit on the machine frame;
• a track stabilization assembly mounted on the main machine frame between the operating unit and a succeeding one of the undercarriages supporting the main machine frame on the track for continuous and non-stop movement therewith;
• a drive for continuously and non-stop advancing the main machine frame in the operating direction;
• and an adjustment drive for adjusting the operating unit in relation to the main machine frame for intermittently advancing the operating unit while the main machine frame advances continuously.