Railway works machine comprising a machine chassis and a works shuttle, and associated railway works convoy

A railway works machine comprises:

• a machine chassis;
• and
• a works shuttle, the machine chassis having two opposite longitudinal end portions and a middle portion connecting the opposite longitudinal end portions, a volume being created underneath the middle portion of the machine chassis to house at least part of the works shuttle, the works shuttle comprising a shuttle chassis and at least one works unit, the shuttle chassis being able to move with respect to the machine chassis, in a longitudinal direction of the works machine, back and forth between two end-of-travel positions, the works machine further comprising a longitudinal locking system which is capable of securing the machine chassis to the shuttle chassis in a position for travel, wherein the longitudinal locking system comprises a first positive engagement locking device between a first of the two longitudinal end portions and the shuttle chassis and a second positive engagement locking device between the shuttle chassis and a second of the two longitudinal end portions, each of the first positive engagement locking device and the second positive engagement locking device capable of withstanding a critical load exceeding 500 kN, in the longitudinal direction.