Controller Of Site Safety (COSS) Practice Exam

What is the minimum time a group must wait in safety before a train passes?

5 seconds 20 seconds 10 seconds 15 seconds

Correct Answer:

10 seconds

Explanation:

A safe margin around the track is what this tests. After a train has passed your position and the track is clear, you need a brief pause before moving back into the danger area. Ten seconds provides a practical buffer that covers the typical time a long train takes to clear the section, plus a little extra in case of wind, debris, or a second train on nearby track. It keeps you out of harm’s way without unduly delaying work. Shorter times (like five seconds) risk still being too close to the train, while longer clears are unnecessarily cautious for normal operations.

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