Railway Concrete Sleeper

A railroad tie/railway tie/cross-tie (North America), or railway sleeper (UK and Australasia) is a rectangular support 

for the rails in railroad tracks. Generally laid perpendicular to the rails, ties transfer loads to the track ballast and sub-grade, 

hold the rails upright and keep them spaced to the correct gauge.

Task of sleepers:
Supporting of rail
Distributing of loads
Keeping the gauge

Track structures according to the type of support:
1．Cross-ties
2．Combination of cross-ties and mono-blocks
3．Mono-blocks
4．Longitudinal beam
5．Slab track

Railway sleeper were traditionally made of wood,but pre-stressed concrete, steel are now widely used.