A railway sleeper or points sleeper is part of the superstructure of a railway. The railway or points sleepers support the rails and the trains that run on them, and keep both rails parallel to each other at the desired track gauge.
The prestressed NS90 sleeper has a length of 2,520 mm and a weight of approx. 285 kg. The beams are placed transversely on the track with centre-to-centre spacing of 600 mm.
The height and width dimensions vary symmetrically over the length axis to produce a wedge shape that helps to bind the sleeper in the ballast bed.
The sleeper is designed for a track width of 1435 mm with a maximum width at the sleeper end of 300 mm and 214 mm high at the position of the rail bedding surface. The beam is designed for a track gauge of 1435 mm with a maximum width at the sleeper end of 300 mm and 214 mm at the location of the rail bedding surface.