Question

Normally, engineers keep a small gap at the joint between two rail tracks, because:

• A. To change tracks
• B. To counter thermal expansion
• C. To reduce the train speed
• D. To reduce noise

Answer 1

The correct option is B To counter thermal expansion

Rails are kept this way to accommodate the change in the length of the rails with change in temperature in summer. If this gap is not kept, then the rails will get distorted due to expansion in summer which may lead to accident.