4 3Rail Fracture Codification of Rail Defects Periods

4. 3_Rail Fracture- Codification of Rail Defects Periods 4

VARIOUS PLANES: VARIOUS PLANES TRANSVERSE PLANE LONGITUDINAL PLANE HORIZONTAL PLANE

UIC- CODIFICATION Rail Fractures and Weld Failures UIC has adopted an Alphanumeric system of codification of rail failures. In view of its international status and the facility afforded for computerized statistical data analysis, this system has been adopted by Indian Railways for reporting rail failures. The code for reporting rail failures consists of two parts viz first – Alphabetic, consisting of three code letters and second numeric, consisting of three or four digits.

UIC- CODIFICATION Rail Fractures and Weld Failures First part of the code – Alphabetic (a) First code letter indicates the type of rail: O indicates Plain rail X indicates Point & crossing rail

UIC- CODIFICATION Rail Fractures and Weld Failures Second code letter which follows the first code letter, indicates the reasons for withdraw of rail. Thus, F indicates Fractured rail C indicates Cracked rail D indicates Defective rail other than F&C

UIC- CODIFICATION Rail Fractures and Weld Failures Third code letter which follows the second code letter, indicates probable cause of failure or rail. Thus: R indicates Cause inherent in rail (attributable to faults in the steel making stage and / or its rolling into rails). S indicates Fault of rolling stock C indicates Excessive corrosion

UIC- CODIFICATION Rail Fractures and Weld Failures Third code letter which follows the second code letter, indicates probable cause of failure or rail. Thus: J indicates Badly maintained joint M indicates Other maintenance conditions (Defects which develop due To ineffective maintenance or delayed renewal of rails). D indicates Derailment W indicates Associated with welding defects (through or adjacent Within 100 mm of a welded joint) O indicates Other causes

UIC- CODIFICATION Rail Fractures and Weld Failures Second part of the code – Numeric : This part of the code consisting of three or four digits indicates the location of the failure in the rail as well as its characteristics : (a) The first digit indicates the location of rail failure (head, web or foot)

UIC- CODIFICATION Rail Fractures and Weld Failures The second digit indicates: (i) The position in the rail section from which failure has started except where failure is associated with welding. (ii) In case of welding, the second digit indicates the type of welding.

UIC- CODIFICATION Rail Fractures and Weld Failures The third digit is interpreted in relation to the first two digits of the code viz : (i) If failure is due to internal defect (first digit 4 or second digit 1, 3 or 5), it shows the direction of the crack or fracture. (ii) If failure is due to surface defect (second digit 2 or 5), it indicates the nature of defect.

UIC- CODIFICATION Rail Fractures and Weld Failures (iii) If failure is by damage (first digit 3), it indicates the cause of the damage (details have been given in succeeding pages) (d) The fourth digit gives further details.

UIC- CODIFICATION Rail Fractures and Weld Failures

UIC- CODIFICATION Rail Fractures and Weld Failures

UIC- CODIFICATION Rail Fractures and Weld Failures

UIC- CODIFICATION Rail Fractures and Weld Failures • On the basis of the system of classification described in USFD Manual para 1. 3. 1. 2, a list of the failure code group to be followed is given as under, along with the meaning of the codes.

UIC- CODIFICATION Rail Fractures and Weld Failures

UIC- CODIFICATION Rail Fractures and Weld Failures

Codes of different failure to be asked by showing different images of Rail Fracture &Weld failure to explain the logic and check the understanding of trainees by concerned Instructors

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