This specification is applicable to the design of Class I and II standard gauge railway subgrades in railway networks where passenger and freight trains run on the same line, the design speed of passenger trains is equal to or less than 160km/h, and the design speed of freight trains is equal to or less than 120km/h.
TB 10001-2005 history
2016TB 10001-2016 Code for Design of Railway Earth Structure
2005TB 10001-2005 Code for design on subgrade of railway