Method for determining vertical and lateral position faults of a track and track maintenance machine

A track maintenance machine for carrying out track position corrections, the track maintenance machine comprising:

• on-track undercarriages to be disposed on rails of a track;
• a machine frame being movable by said on-track undercarriages and having a track lifting and lining unit;
• a track position measuring system including track position measuring units each registering a track position, said track position measuring units following one another in a longitudinal direction of the track maintenance machine;
• and
• a reference base at which all of said track position measuring units are disposed, said reference base being formed of a single measuring chord to be disposed centrally between the rails and extending in the longitudinal direction of the track maintenance machine;
• and
• said track position measuring units including a central track position measuring unit having two track tracing rollers and a measuring base interconnecting said two track tracing rollers;
• said two track tracing rollers being adjustable in height together with said measuring base and a measuring transducer disposed on said central track position measuring unit relative to said track lifting and lining unit and relative to a vertical.