Light railway system

A light railway system comprising two parallel rails, and two separate trough structures, one for each rail, each rail having a base portion with a flat bottom, an upward-extending web, and a railhead, and resting within a respective trough structure, each trough structure comprising multiple trough units arranged end to end, with rigid blocks that fit and extend between the web of the rail and side portions of the trough unit so as to locate the rail within the trough structure, wherein each trough unit comprises an outer generally-rectangular and open-topped first trough element, defining side walls and a base, and a second trough element that defines a recess to locate the rail and the blocks, and that defines edge flanges fixed to the top edges of the side walls of the first trough element, the base of the recess being supported by the base of the first trough element, and the system also including multiple spaced-apart rigid ties that interconnect the trough structures, to hold the trough structures at a desired separation, so the rails are at a desired separation.