Track renewal machine SUM 312
SUM 312 – a self-propelled machine made by Plaser & Theurer designed for pipelined superstructure replacement. SUM continuously exchanges sleepers and rails, which takes place within its interior. The machine is equipped with a special set of mechanisms for selecting and transporting materials, among which the most important is SWAL main working group – responsible for simultaneous removal and installation of sleepers and rails, and a set of two cranes that transport old and new ties between the team and work platforms which are part of the whole train. In contrast to the commonly used methods for automating the superstructure replacement operations performed by SUM significantly reduces the duration of the contracted work and reduces to a minimum the number of workers needed.