Why should a school bus driver never shift gears while crossing railroad tracks?

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1. A missed or mistimed shift could stall the bus directly on the tracks, an extremely dangerous position if a train approaches
2. Shifting gears while crossing tracks has no bearing on bus safety
3. Shifting mid-crossing is the recommended technique for a smoother ride, since a bus that lugs on the tracks can stall out
4. This concern applies only to buses with a manual transmission

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