Question

Which of the following types of Elastic fastenings can be used on all types of sleepers (like Wooden, cast-Iron or Concrete) on Indian Railways?
1. Sigma clip
2. IRn-202 clip
3. LG-20 Lock spike
4. Pandrol clip

Answer 1

Correct Answer - Option 4 : Pandrol clip

Concept:

Pandrol Clips

• The pandroi clips or elastic clip has different numbers. The one for our use in PR401 clips. (Pandrol 401 clips).
• It is applied parallet to the rails and is driven and removed with an ordinary hammer.
• This clip is fit and forget type.
• This can be used at any locations with any type of connectivity.
• The use two fixtures ⇒ base plates and C.I. inserts.
• Base plate is similar to bearing plate.
• CI inserts ae used to connect these clips to the sleepers at the bottom.
• Toe load 710 kg for nominal deflection of 11.4 mm
• Point contact cause indentation on rail foot.
• Gauge adjustment is difficult.
• Pandrol can be used with advantage on wooden, steel, concrete and CI sleepers.
• Panorol rail fastenings assembly for wooden sleepers ⇒ Pandrol rail clips, rubber pads, steel on CI base plate.

 

IRN 202 Clip

• Devised by Indian Railways.
• Mostly used for two block RCC sleepers.
• Toe load has been increased to 1000 kg from 710 kg for the pandrol clip.
• Deflection limit has been increased to 18.5 mm from 11.5 for the pandrol clip.
• Removal of rail is easy in this case.
• Creep resistance is 50% of the toe load.
• Not fit or forget type.