Railway Maintenance and Repair

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Questions and Answers

What is the maximum vertical wear allowed for a 60 kg/m rail section?

10.00 mm

8.00 mm

13.00 mm (correct)

6.00 mm

Where is the lateral wear measured on a rail?

13 to 15 mm below the rail top table (correct)

20 mm below the rail top table

5 mm below the rail top table

10 mm below the rail top table

What is the speed in km/h after the 3rd day's events?

110

40 (correct)

What is the lateral wear limit for 'C' & 'D' Routes in curves?

10 mm Signup and view all the answers

What is done on the 1st day?

Opening, Relaying and equalisation of ballast Signup and view all the answers

Why may renewals be necessary on a track?

Both A and B Signup and view all the answers

What is the purpose of superimposing the worn rail profile over the new rail profile?

To determine the lateral wear Signup and view all the answers

What happens on the 5th day?

2nd tamping in smoothening mode and 2nd stabilisation Signup and view all the answers

What is the lateral wear limit for 'A' & 'B' Routes in curves?

8 mm Signup and view all the answers

What is the speed on the 2nd day?

30 Signup and view all the answers

What is the maximum vertical wear allowed for a 52 kg/m rail section?

8.00 mm Signup and view all the answers

What happens on the 10th day?

Checking ride quality and attention as required Signup and view all the answers

Why is it necessary to maintain a track to prescribed standards?

All of the above Signup and view all the answers

What is the speed on the 9th day?

110 Signup and view all the answers

What happens on the 6th day?

Survey of track for design tamping Signup and view all the answers

What is done on the 7th and 8th days?

Ballasting and boxing of ballast Signup and view all the answers

What is the length of the free rail in meters?

13m Signup and view all the answers

What type of sleepers should be used for both running lines and yard lines?

Concrete sleepers Signup and view all the answers

What type of rail will be used in non-running lines of yards?

Class II rail Signup and view all the answers

What is the purpose of classifying released material?

To re-use the material in tracks Signup and view all the answers

How should the rails be graded after a section of track has been renewed?

By their weight and condition Signup and view all the answers

What should be done to the rail-ends that are worn or hogged?

Cropping the ends Signup and view all the answers

What should be done to the sleepers after a section of track has been renewed?

Classify them into grades suitable for re-use Signup and view all the answers

What is done to the welds in short rails during track renewal?

They are welded into LWR Signup and view all the answers

What should be done to Fish-plates, fish-bolts, ERCs, and Liners?

Sort them into reusable and scrap materials Signup and view all the answers

What should be done to badly worn switches and crossings?

Recondition them by welding if the wear is not excessive Signup and view all the answers

What is Class I Material?

New Material of standard section Signup and view all the answers

What is included in Class II Material?

All Material released from the track and fit for further use Signup and view all the answers

What is Class II (a) rail used for?

Running lines Signup and view all the answers

What is included in Class III Materials?

Unserviceable Material and scrap Signup and view all the answers

Why are some new items of obsolescent sections brought on to the stock account as Class I Material?

To prevent wastage of other serviceable Material Signup and view all the answers

What is done to small fittings like stretcher bars, switch anchors, stud-bolts and blocks if the switches and crossings are badly worn?

They are generally reused Signup and view all the answers

When is the relaying work considered complete?

When all released materials are removed from the site Signup and view all the answers

What is the purpose of temporary strengthening of gangs?

To maintain the track to the required standard for the maximum permissible speed Signup and view all the answers

What is the purpose of description boards?

To display information about track materials Signup and view all the answers

When should the permanent way diagrams be revised?

After the relaying is completed Signup and view all the answers

Who should be advised about the revised permanent way diagrams?

All concerned, including the ADEN, SSE/P.Way, DEN, and Divisional office Signup and view all the answers

What should be updated in the TMS?

The daily progress details Signup and view all the answers

When should the accounts for relaying works be closed?

Within 3 months of completion of the work Signup and view all the answers

What should be submitted with the closed accounts?

A completion report Signup and view all the answers

Study Notes

Rail Wear and Maintenance

Typical rail wear profile shows vertical wear limits of 13.00 mm for 60 kg/m rail section and 8.00 mm for 52 kg/m rail section.
Lateral wear limits are 8 mm for 'A' & 'B' routes and 10 mm for 'C' & 'D' routes in curves, and 6 mm for 'A' & 'B' routes and 8 mm for 'C' & 'D' routes in straight tracks.
Lateral wear measurement is taken at 13 to 15 mm below the rail top table.

Maintainability of Track

Track maintenance requires renewals based on poor running quality, disproportionate maintenance costs, or other considerations.
A sequence of events is followed for track maintenance, including ballasting, tamping, stabilisation, and surveying.

Machine Packing and Stabilisation

Machine packing followed by stabilisation is used for mechanised laying of track.
The sequence of events includes opening, relaying, and equalisation of ballast, followed by welding, tamping, and stabilisation.

Sleepers and Rails

Concrete sleepers are used for both running lines and yard lines.
Class II rail is used for non-running lines in yards.
Short welded panels of 3 rail length may be used for through rail renewals or complete track renewal in yards.

Classification and Use of Released Material

Released material is classified into Class I (new material), Class II (new material of obsolescent sections or used material fit for further use), and Class III (unserviceable material).
Class II material is sub-divided into Class II (a) for use in running lines and Class II (b) for use in non-running lines.
Fish-plates, fish-bolts, ERCs, and liners are sorted into reusable and scrap materials.
Switches and crossings are reconditioned by welding if the wear is not excessive.

Temporary Strengthening of Gangs and Revision of Permanent Way Diagrams

After relaying, regular maintenance gangs are temporarily strengthened to maintain the track to the required standard.
Permanent Way diagrams are revised to reflect the new track materials and details.
The revised diagrams are updated in the Divisional office and headquarter, and advised to all concerned.

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Description

Learn about the process of reconditioning and reusing railway switches and crossings, including sorting and reusing fish-plates, fish-bolts, and other small fittings.