Railway Curve Alignment and Cant Design
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Questions and Answers

What is the recommended ballast cushion depth when the radius of curvature is flatter than 600 M?

  • 350 mm (correct)
  • 300 mm
  • 400 mm
  • 250 mm
  • What is the minimum formation width recommended for new works in both embankment and in cuttings?

  • 7900 mm
  • 8000 mm
  • 7850 mm (correct)
  • 7500 mm
  • What should be the ballast cushion depth on the outside of curves with a radius of less than 600 M?

  • 400 mm (correct)
  • 350 mm
  • 450 mm
  • 500 mm
  • What type of track requires a ballast cushion depth of 400 mm on the outside of all curves, regardless of radius?

    <p>Short welded panel track</p> Signup and view all the answers

    What should be the cross-slope for new works?

    <p>1 in 30</p> Signup and view all the answers

    What is the recommended ballast volume for a curve with a radius of less than 600 M and a gauge sleeper of 350 mm?

    <p>2.282 M3</p> Signup and view all the answers

    What is the recommended ballast cushion depth in the case of curves in passenger yards?

    <p>550 mm</p> Signup and view all the answers

    What should be ensured for new works in both embankment and in cuttings?

    <p>Minimum formation width of 7850 mm</p> Signup and view all the answers

    What is the maximum permissible cant that can be provided in a section?

    <p>165 mm</p> Signup and view all the answers

    What is the primary consideration for determining the maximum cant excess?

    <p>Slowest moving train</p> Signup and view all the answers

    What is the maximum permissible speed on a 1-degree curve with a cant deficiency of 100 mm?

    <p>160 Kmph</p> Signup and view all the answers

    What is the standard specification for flat-bottom rails used on Indian Railways?

    <p>IRS-T-12</p> Signup and view all the answers

    What are the two predominant types of rails used on Indian Railways?

    <p>52 Kg/m and 60 Kg/m</p> Signup and view all the answers

    What is the purpose of surveying each curve, including fixed installations?

    <p>To undertake realignment of curves</p> Signup and view all the answers

    What is the maximum permissible speed on a 2-degree curve with a cant deficiency of 100 mm?

    <p>130 Kmph</p> Signup and view all the answers

    What is the reference point for instructions in case the track structure does not fulfill the requirements?

    <p>Railway Board</p> Signup and view all the answers

    Where is the information about glued joint number, month, year of manufacturing, and the code of the manufacturer embossed?

    <p>On both gauge and non-gauge face sides of the rail head</p> Signup and view all the answers

    What is the purpose of an expansion joint installed at each end of LWR/CWR?

    <p>To permit expansion/contraction of the adjoining breathing lengths</p> Signup and view all the answers

    What type of SEJ is provided between two different rail sections?

    <p>Combination SEJ</p> Signup and view all the answers

    What is the primary material used in the manufacture of Elastic Rail Clip (ERC)?

    <p>Silico-manganese Spring steel</p> Signup and view all the answers

    Where can detailed information about glued joints and SEJ be found?

    <p>All of the above</p> Signup and view all the answers

    Why are rail joints avoided in small bridge openings less than 6.1 m?

    <p>To avoid weakening the bridge structure</p> Signup and view all the answers

    What is the primary function of Grooved Rubber Sole Plate (GRSP)?

    <p>To absorb high frequency vibrations, shocks and reduce noise</p> Signup and view all the answers

    What is the characteristic of the top layer of Composite GRSP?

    <p>Higher modulus of elasticity (harder)</p> Signup and view all the answers

    What is the preferred position of the rail joint in bridges?

    <p>At 1/3 the span from either end</p> Signup and view all the answers

    What type of girders are provided with camber?

    <p>Open web girders of span 30.5 m and above</p> Signup and view all the answers

    What is the specification for 6.2 mm Composite GRSP?

    <p>RDSO/M&amp;C/RP-198/2006</p> Signup and view all the answers

    How are tracks laid on bridges with camber?

    <p>Following the camber of the girder</p> Signup and view all the answers

    What is the purpose of Liner in conjunction with GRSP/ CGRSP and rail?

    <p>To achieve the correct track gauge to provide for the correct deflection of the ERC</p> Signup and view all the answers

    What is the primary application of Nylon Cord Reinforced GRSP?

    <p>For use below Crossings of Turnouts</p> Signup and view all the answers

    What is the specification for 6 mm thick Nylon Cord Reinforced GRSP?

    <p>RDSO/M&amp;C/RP-201/2007</p> Signup and view all the answers

    Where should the harder layer of Composite GRSP be placed in relation to the rail?

    <p>In contact with the rail</p> Signup and view all the answers

    What is the weight of the ERC-J type rail?

    <p>1 kg</p> Signup and view all the answers

    What is the thickness of GRSP for 52 kg Rail and 52 kg Sleeper?

    <p>6 mm</p> Signup and view all the answers

    What is the RDSO drawing number for GRSP Set for Turnout 1 in 12 - 60 kg?

    <p>RT-4218</p> Signup and view all the answers

    What is the thickness of Composite GRSP for 52kg / 60 kg Rail on PSC sleeper?

    <p>6.2 mm</p> Signup and view all the answers

    What is the RDSO drawing number for GRSP Set for Derailing Switch (60 kg)?

    <p>RT-6068</p> Signup and view all the answers

    What is the thickness of GRSP for 60 kg running rail on channel sleeper?

    <p>10 mm</p> Signup and view all the answers

    What is the RDSO drawing number for 6 mm thick GRSP for SEJ?

    <p>RT-4159</p> Signup and view all the answers

    What is the thickness of GRSP with horns for Turnouts (1 in 12 & 1 in 8.5)?

    <p>6 mm</p> Signup and view all the answers

    Study Notes

    Cant and Curve Design

    • Maximum permissible cant of 165 mm can be provided in curves to fully exploit speed potential.
    • Cant deficiency of 100 mm results in maximum permissible speeds of 160 Kmph and 130 Kmph for 1 degree and 2 degree curves, respectively.

    Rail and Rail Fastenings

    • Rails are manufactured as per Indian Railway Standards specification for flat bottom rail (IRS-T-12).
    • Flat-footed rails of 60 Kg/m and 52 Kg/m are used predominantly on Indian Railways.
    • Standard sections of rails include:
      • Elastic Rail Clip (ERC): manufactured from Silico-manganese Spring steel with designed Toe load at design deflection.
      • Grooved Rubber Sole Plate (GRSP): manufactured from rubber compound to absorb high frequency vibrations, shocks, and reduce noise.
      • Composite GRSP: developed for improved performance with two layers of different types of rubber.
    • Fastenings on PSC sleepers include:
      • ERC: manufactured from Silico-manganese Spring steel.
      • GRSP: manufactured from rubber compound.
      • Composite GRSP: manufactured to RDSO specifications for improved performance.
      • Nylon Cord Reinforced GRSP: designed for use below Crossings of Turnouts.

    Ballast Cushion and Track Structure

    • Ballast cushion depths:
      • 250 mm for straight tracks and curves of radius flatter than 600 M.
      • 300 mm for curves of radius sharper than 600 M.
    • Ballast cushion requirements:
      • Depth of ballast cushion should be provided as per Para 212(2) of IRPWM.
      • Minimum formation width of 7850 mm should be ensured for new works in both embankment and in cuttings.

    Track Structure on Bridges

    • Longitudinal Profile of Rails:
      • No camber is provided in standard plate girders.
      • Open web girders of span 30.5 m and above are provided with camber.
    • Rail joints over the Bridge:
      • Avoided in small bridge openings less than 6.1 m.
      • Preferred position of the rail joint is at 1/3 the span from either end.

    Glued Joints and Switch Expansion Joint

    • Marking of Glued Joints:
      • Details of glued joint number, month, year of manufacturing, and code of the manufacturer are embossed on the gauge and non-gauge face sides of the head of the rail.
    • Switch Expansion Joint:
      • Installed at each end of LWR/CWR to permit expansion/contraction of the adjoining breathing lengths due to temperature variations.
      • Normally provided for same rail sections.

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    Description

    Quiz on the design and alignment of railway curves, including cant design and safety constraints. Learn about the calculations and considerations for optimal curve design.

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