Track components: The “heel of crossing” is the line joining which elements in a turnout/crossing?

Introduction / Context:
In permanent way terminology, correct identification of parts of a turnout or crossing is vital for inspection and maintenance. The “heel of crossing” is a specific reference line used in laying and gauging.

Given Data / Assumptions:

• Standard Indian Railways nomenclature for crossings.
• Crossing comprises nose (actual point), throat region, wing rails, and lead rails.

Concept / Approach:
The heel of crossing is located away from the nose; geometrically it corresponds to the line joining the ends of the wing rails. This line is used as a reference for positioning, fittings, and maintenance checks.

Step-by-Step Solution:
Identify the wing rails which flank the nose and provide flangeway clearance.Locate their ends at the rearward side of the crossing.Join these ends → that line is the heel of crossing.

Verification / Alternative check:
Standard drawings of crossings clearly label the heel line at the ends of wing rails opposite the nose.

Why Other Options Are Wrong:

• (a) Mixes splice and point rail—relevant to switch, not the heel line of crossing.
• (b) Refers to lead rails; not the heel definition.
• (d) Throat to nose defines a forward region near the actual point.
• (e) Not a recognized definition for the heel line.

Common Pitfalls:
Confusing switch terminology (point, stock, splice rails) with crossing parts (nose, wing rails, heel).

Final Answer:
Ends of the wing rails