Infrastructure Infrastructure - We have a large number of structures and buildings along the line, which all need maintaining, and, in many instances updating. Volunteers with civil engineering, building or electrical experience are particularly needed – either to work within Station Groups, or directly within the Infrastructure Department. Permanent Way – The P. W. Department is responsible for the maintenance and renewal of our 18 miles of main line and sidings, which, as well as track and ballast, includes ditches and fences. Signalling and Telecommunications – The S. & T. Department’s work includes the installation and maintenance of modern colour light signals and traditional semaphores, block signalling, and internal telephone systems. Electrical, mechanical and telecommunications skills are all used.