Classification of Track Renewal Works

Track renewals can be broadly classified as under.

Complete track renewal This implies the renewal of all the components of a track over a particular length. The necessary recoupment of the ballast and the provision of a full ballast cushion is also done along with complete track renewal (CTR).

Through rail renewal Through rail renewal or TRR involves the renewal of all the rails between one point and the next.

Through sleeper renewals This entails the renewal of the entire lot of sleepers from one point to another. The necessary recoupment of the ballast and the provision of a full ballast cushion is also done along with TSR (through sleeper renewal).

Casual renewal This implies the replacement of some of the unserviceable rails or sleepers or both with serviceable, released rails and sleepers of a similar type and age.

Primary renewals This refers to renewals that are done using new permanent way materials.

Secondary renewals This refers to renewals that are done using released, serviceable permanent way material.

Rehabilitation and Renewal of Track | RAILWAY ENGINEERING | Criteria for Rail Renewals