How does this sign differ from the crossbuck sign posted right at a railway crossing?

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Correct answer: A. It's advance warning further back, and also shows the angle the tracks cross the road

This diamond sign is advance warning that a railway crossing is coming up, and also shows the angle at which the tracks cross the road — the crossbuck itself, posted at the crossing, marks the crossing directly rather than warning of one ahead.

Source: MTO Driver's Handbook: Signs — Warning signs

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