I seen this sigh and wonder if its for MOW or something to do with track work?
That's a CSX warning board for a speed restriction or Rule 89 (MOW Work Limits).
Thanks I seen this one time before around Walton ky and it was explained to me but I wasn't listening (sorry Mr.Hanks )
Advance Warning sign, indicates either a temporary slow order or work limits (704/707) two miles in advance. Also referred to as a 'firecracker' by some crews.