Correct Answer - Option 4 : Heel divergence
Concept
Heel Clearance or Heel Divergence
- It is the distance between the running faces of the switches rail and the stock rail measured perpendicular to the latter at the heel of the switch.
- Indian standard specifies heel clearance for BG track as 13.7 cm – 13.9 cm.
Flange way Clearance
- The distance between the adjacent faces of the running rail and the guard or the check rails provides clearance for passage of wheel flanges.
Throw of Switch
-
The gap through which the toe of the gauge rail moves sideways to provide a path for the required direction over the turnout.
- Throw of switch according to Indian standard: BG = 9.5 cm, MG/NG = 8.9 cm
Switch angle
- The angle between the gauge face of stock rail and tongue rail.