SGR Railway Sleeper Identification
The XII design sleeper is the most common and is used in straight line tracking. When a turn-out has to be made along two lines, special sleepers are installed which vary in length. Also on bridges, the XIII design is used when the line is on a bridge
The initial production started with the XII design sleeper which is used when the line is moving on a straight line with minimal curves. This design is by far the most common and the dimensions are fixed, same for all sleepers of this design.
At some points when 2 parallel lines have to be joined, the junction is called a turn-out. This enables the train to smoothly change lines. The sleepers installed at this point will vary in length depending on the length of the turn-out. In this design, the length of the sleepers will not be the same.
The XIII design is used when a railway line has to be installed in a beam of a bridge. This design's nomenclature will have a proceeding Q (XIIIQ) which stands for Qiao, a Chinese word for bridge.
All sleepers will bear the mould number on one top-end of the sleeper and a serial number on the other end.