What does a white X-shaped crossbuck sign mark?

Correct answer: D – A railroad crossing
A crossbuck marks a railroad crossing at the tracks. At a passive crossing, look in both directions for rail traffic and slow or stop as necessary. Do not proceed until you have checked that all tracks are clear and can cross safely.
Source: What Every Driver Must Know — Ch. 5, “Traffic signs” and “Traffic sign challenge answers,” RR Crossbuck, What Every Driver Must Know — Ch. 4, “Passive railroad crossing control systems”


