The invention relates to an on-track maintenance machine for maintaining a superstructure with a track panel formed of sleepers and rails fixed thereon that is supported on a ballast bed, comprising a lifting and lining unit for track lifting and lining and a tamping unit for track tamping. In the invention, at least one rail treatment unit for continuous reprofiling of the rails is arranged on a machine frame. The elimination of rail defects contributes to a higher durability of the corrected track position, as after re-opening the treated track section, the rails can be used again trouble-free.

The invention relates to an on-track maintenance machine for maintaining a superstructure with a track panel formed of sleepers and rails fixed thereon that is supported on a ballast bed, comprising a lifting and lining unit for track lifting and lining and a tamping unit for track tamping. In the invention, at least one rail treatment unit for continuous reprofiling of the rails is arranged on a machine frame. The elimination of rail defects contributes to a higher durability of the corrected track position, as after re-opening the treated track section, the rails can be used again trouble-free.

A railway nipper machine is provided that includes a nipper frame having a pair of nipper hooks for performing a nipping operation, and a position feedback device having a central control module configured for controlling the nipping operation based on a depth signal and a time signal. Further included in the nipper machine is a depth sensor connected to the position feedback device for generating the depth signal relative to a nipper actuator connected to the nipper frame, wherein the depth sensor transmits the depth signal to the position feedback device. A timer is provided for generating the time signal, and the nipper machine is actuated by the nipper actuator in response to a determination value generated by the position feedback device based on the depth signal and the time signal.

A railway nipper machine is provided that includes a nipper frame having a pair of nipper hooks for performing a nipping operation, and a position feedback device having a central control module configured for controlling the nipping operation based on a depth signal and a time signal. Further included in the nipper machine is a depth sensor connected to the position feedback device for generating the depth signal relative to a nipper actuator connected to the nipper frame, wherein the depth sensor transmits the depth signal to the position feedback device. A timer is provided for generating the time signal, and the nipper machine is actuated by the nipper actuator in response to a determination value generated by the position feedback device based on the depth signal and the time signal.