Switch Expansion Joint

A Switch is an arrangement that enables the train to change its track so that it proceeds in the correct direction. This SEJ is a device, installed at the end of LWR/CWR, to allow the longitudinal movements in the breathing length due to temperature variations or we can say it is an arrangement that compensates with the natural changes in the track due to temperature variations and protects the technical standard dimension of the same. This arrangement ensures that there is no considerable variance in the parameters of the track so that there is no hindrance is created in the passage of the wheel over it. Both expansion and contraction are dealt with by the SEJ.

Improved Switch Expansion Joint

To overcome the defects caused by bend in Switch Expansion Joint the design has been modified to Improved Switch Expansion Joint. Rail movement joints are required when tracks are laid across engineering structures such as bridges and viaducts. These structures are exposed to changes in lengths due to ambient influences like traffic load, temperature and wind. These influences sometimes lead to angular rotations of the end spans in the abutment. Rail movement joints are installed to bridge such length variations and - if required - to accommodate angular rotations of the end spans.

Advantage of Improved Switch Expansion Joint

  • To avoid two bends involved in the design of the STOCK Rail & TONGUE Rails in conversional type of Switch Expansion Joint.
  • To avoid fractures in the bent portion of the STOCK Rail & TONGUE Rails in conversional type of Switch Expansion Joint.
  • To meet other requirements like wide gap at bridge approaches.
  • Suitability in curves sharper than 0.5° and up to 0.4°
  • Suitability for higher axle load
  • Suitability for iron ore route
  • Suitability for heavy mineral route
  • Suitability for high speed routes.
  • Check Rail guard against excessive play of worn out wheels.
  • Easy maintenances.
  • Less wheel impact
  • More Wheel Support