Wood sleeper is a sleeper made of wood, also known as sleeper. China's national standard is :GB9221-88 anticorrosive wooden pillow production wooden pillow must choose tough and elastic wood

Wooden pillow according to the use can be divided into ordinary wooden pillow, switch wooden pillow, bridge wooden pillow. Common wooden sleeper is used in the main line of railway track. GB standard has 2 types: type I with 16cm×22cm×250cm; type II with 14.5cm×20cm×250cm.

Ordinary wooden pillow: the standard length is 2.5 m, and its section shape is divided into two categories: I and II. Class I: Width 22cm, thickness 16cm; Class II: Width 20cm, thickness 14.5cm; Used on different levels of the line.

Switch tie: A wooden tie used on a switch. There are two standard section sizes:The standard of type 75 is: width 22cm, thickness 16cm; Length from 260cm to 485cm, each length difference of 15cm, a total of 16 length specifications.

The standard of type 92 is: width 24cm, thickness 16cm; Length from 260cm to 480cm, each length difference of 20cm, a total of 12 length specifications.

The wooden pillow has the advantages of good elasticity, easy processing and convenient use. Since its own railway, wooden tie is the main type of sleeper. However, due to the material, the elasticity, strength and durability of the wooden pillow are not uniform enough, which will increase the dynamic effect of the wheel and rail, and a large number of high-quality wood should be used. The service life of the wooden tie is short, and there are many reasons for its failure, mainly decay, mechanical wear and cracking. Because the wooden pillow is easy to decay, it should be treated with anti-corrosion before going on the road. Wooden pillows that have not been treated with corrosion are called plain pillows. China's timber resources are scarce and expensive, and it has been gradually replaced by concrete pillows on the main trunk lines.

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