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Questions and Answers

What is the preferred type of rail to be used with combination fishplates?

Rail sections with custom designs

Short rail sections

Rail sections with standard drawings

Full length of rail (correct)

What is the specification for combination fishplates?

IRS-T-1 (correct)

IRS-T-39

IRS-T-45

RDSO specification No IRS-T-46

What type of sleepers are widely used in Indian Railways?

Concrete Sleepers (correct)

Cast Iron Sleepers

Wooden Sleepers

Steel Trough Sleepers

What type of concrete sleepers are predominantly used in Indian Railways?

Mono-block concrete sleepers Signup and view all the answers

What is the purpose of mechanised tamping in PSC sleepers?

To facilitate mechanised tamping Signup and view all the answers

What is the specification for PSC sleepers in plain track?

IRS-T-39 Signup and view all the answers

How can concrete sleepers be identified?

By their drawing number Signup and view all the answers

What type of sleepers are used in specific locations like girder bridges?

Composite Sleepers Signup and view all the answers

What is the purpose of providing Side Pathways and Walkways?

To ensure safety of maintenance staff Signup and view all the answers

What is the material used for making walkways?

Chequered plates with hole Signup and view all the answers

Where are Walkways provided?

Inside the track Signup and view all the answers

What is the purpose of fixing Guard Rails?

To support the bridge Signup and view all the answers

What is the source of guidance for field officials?

Track Manual Signup and view all the answers

What is the purpose of Annexure - 2/4(A)?

To provide a list of commonly used track fittings Signup and view all the answers

What type of sleepers are used for fixing Guard Rails?

Concrete sleepers with ballasted deck Signup and view all the answers

What is the purpose of Joggled Fish Plates?

To connect two rails Signup and view all the answers

Where should special attention be given to ensure full ballast section?

At bridge, level crossing and tunnel approaches Signup and view all the answers

What is the purpose of planing the fishing planes on ordinary fishplates?

To accommodate channel type insulation between rails and fishplates Signup and view all the answers

How many separate assessments should be made for ballast requirements?

Four Signup and view all the answers

What is the purpose of making good deficiencies arising out of overhauling?

Through packing/tamping Signup and view all the answers

Why should the distance between staggered joints not exceed the minimum wheelbase of the vehicles?

To allow for smooth movement of the vehicle Signup and view all the answers

What should be removed from bolt-holes to ensure proper installation of insulated joints?

Rough edges and burrs Signup and view all the answers

How often should the ballast required for maintenance purposes be estimated?

Every 1 km Signup and view all the answers

What is the purpose of using high polymer adhesive in glued insulated joints?

To increase the strength of the joint Signup and view all the answers

What should be taken care of during the assessment of ballast required for maintenance?

The cores under the sleepers should not be disturbed Signup and view all the answers

What type of material is used to make the insulating side channels, bushes, and end posts in glued insulated joints?

Fiberglass cloth roving Signup and view all the answers

How often should deep screening be done to assess ballast required?

Every 0.5 km Signup and view all the answers

What is done during deep screening?

Screening is done under the sleepers Signup and view all the answers

In what type of tracks should G3L type glued insulated joints be used?

LWR/CWR tracks Signup and view all the answers

What are the quantities assessed for ballast required?

Net quantities Signup and view all the answers

Where can the instructions for fabrication, installation, and maintenance of glued insulated rail joints be found?

In the manual for glued insulated rail joints Signup and view all the answers

What is the primary advantage of using glued insulated joints over standard insulated joints?

Reduced maintenance Signup and view all the answers

What is the use of Joggled Fish Plates EDO/T-2242 and 2243?

For 75 mm wide gap A.T.Weld Signup and view all the answers

Which type of sleeper is designed for 22.9 t axle load?

Ordinary Prestressed Concrete Sleeper for 60kg/52kg rail Signup and view all the answers

What is the purpose of RT-4183-4186 PSC Sleeper?

For curve with check rail for 60kg rail Signup and view all the answers

What is the use of RT-4865 Sleeper Set?

For 1 in 8 ½ Fan shaped layout Signup and view all the answers

What is the use of RDSO/T-2572 Glued Insulated Rail Joint?

For B.G. 60kg (UIC)-G3(L) Signup and view all the answers

What is the use of B-1636/R2 Steel Channel Sleepers?

For plain track application Signup and view all the answers

What is the purpose of T-5849 Joggled Fish Plates?

For use on welded joint for B.G. 60kg rail Signup and view all the answers

What is the use of RT-7014 to 7021 Nylon Cord Reinforced GRSP?

For placing beneath crossing portion in 1 in 12 turnouts Signup and view all the answers

Study Notes

Combination Fishplates and Sleepers

Combination fishplates should comply with RDSO specification IRS-T-1.
Combination rails prepared by welding two rail sections are preferred over combination fishplates.
Field officials can refer to Annexure - 2/4 (A) and 2/4 (B) for guidance on commonly used fittings.

Sleepers

There are four types of sleepers: wooden, cast iron, steel trough, and concrete sleepers.
Concrete sleepers are widely used, while wooden, cast iron, and steel trough sleepers are obsolete.
Composite sleepers are being introduced in specific locations, such as girder bridges, points, and crossings.

Concrete Sleepers

Indian Railways predominantly use mono-block pre-stressed concrete (PSC) sleepers.
PSC sleepers provide longitudinal and lateral stability required for LWR and are suitable for mechanized tamping.
PSC sleepers are manufactured to conform to RDSO specifications IRS: T-39 (Plain Track) and IRS: T-45 (Turnout sleepers).

Ballast Requirements

Ballast requirements should be assessed separately for making good deficiencies, overhauling, and providing adequate cushion.
The quantity of ballast required should be estimated by surveying a rail length every 1 km.

Insulated Joints

Insulated joints should be laid as square joints, and rail ends should be square and true.
Glued insulated joints have been developed using resin adhesives and are recommended for use in track circuiting.

Sleepers and Fastenings

Provision of side pathways and walkways should be made on new girder bridges and existing bridges.
Guard rails should be fixed on concrete sleepers on ballasted deck bridges and approaches as per approved RDSO drawings.

Annexure - 2/4(A)

The annexure lists commonly used track fittings for the guidance of field engineers, including fish plates, joggled fish plates, and glued insulated rail joints.

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