Which component is mounted to the running rail to keep wheels in around curves?

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Multiple Choice

Which component is mounted to the running rail to keep wheels in around curves?

Explanation:
When a wheelset negotiates a curve, it tends to push inward or climb the rail if not guided, so a secondary rail is used to constrain that motion. The restraining rail is mounted to the running rail and provides a secondary contact point on the inside of the curve. This rail helps keep the wheels within the correct gauge and prevents flange climbing, ensuring the train stays on track as it rounds the bend.

When a wheelset negotiates a curve, it tends to push inward or climb the rail if not guided, so a secondary rail is used to constrain that motion. The restraining rail is mounted to the running rail and provides a secondary contact point on the inside of the curve. This rail helps keep the wheels within the correct gauge and prevents flange climbing, ensuring the train stays on track as it rounds the bend.

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