P Way, Works & Bridge (Civil Engineering) Guide (Rly) etc.: Rail Renewal

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Short Notes - Criteria for Rail Renewal

Criteria for rail renewal-

The following are to be considered in connection with the criteria of rail renewals:-

•Incidence of rail fracture / failures.

•Wear on rails.

•Maintainability of track to prescribed standards.

•Expected service life in terms of Gross million tones carried.

•Plan based renewals.

Permanent Way Renewal

Classification of Renewals –

All track renewals can be classified generally into one of the following categories :

(1) Complete Track Renewal (Primary) abbreviated as C.T.R.(P)

(2) Complete Track Renewal (Secondary) abbreviated as C.T.R.(S)

(3) Through Rail Renewal (Primary) abbreviated as T.R.R.(P)

(4) Through Rail Renewal (Secondary) abbreviated as T.R.R. (S)

(5) Through Sleeper Renewal (Primary) abbreviated as T.S.R. (P)

(6) Through Sleeper Renewal (Secondary) abbreviated as T.S.R. (S)

(7) Casual Renewals.

(8) Through Turn-out renewal (TTR)

(9) Through Fitting renewal (TFR)

(10) Through Weld renewal (TWR)

(11) Through Bridge timber renewal (TBTR)

(12) Scattered renewal

(2) Primary renewals are those where only new materials are used and secondary

renewals are those where released serviceable materials are used.

(3) Scattered Renewal- In this case, unserviceable rails, sleepers and fastenings are replaced by identical sections of serviceable and nearly the same vintage track components. These are carried out in isolated locations and not more than 10 rails and/or 250 sleepers in a gang beat in a year. Such renewals are a part of normal maintenance operations.