Number of Tracks Plaque
White plaque mounted under the Crossbuck — 2 TRACKS, 3 TRACKS and up — wherever a crossing has more than one track.
MUTCD R15-2 (R15-2P) · 27 × 18 in (Table 8B-1, conventional road; larger signs may be used — Section 2A.12)

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About the Number of Tracks Plaque
At a crossing with two or more tracks, MUTCD Section 8B.03 puts a Number of Tracks plaque on the Crossbuck's post, below the blades, saying how many tracks there are. A second train can be hidden behind the first: once one passes, a driver who knows there are more tracks waits until they're clear too. The plaque is black on white like the Crossbuck itself.