Manufacture
Concrete sleepers are made upside down in moulds, several sleepers long. Pandrol clip bases or other fittings are inserted into the moulds. Pretensiled steel wire are installed in these moulds, and then the concrete is poured. It takes several days for the concrete to cure, after which the sleepers are removed from the moulds and cut into individual sleepers. The bottom of the mould is marked with the logo of the manufacturer and a datestamp.
Occasionally sleepers are made with conduits for track circuit wiring, or extra fixtures for guard rails.
Sleepers can be made using a Long Line method or a Short Line method; each method has its advantages and disadvantages.
Read more about this topic: Concrete Sleeper
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