Aldon’s permanent, highly visible, all-weather track clearance marker tells switching crews how far they can shove or park a car without "fouling" the converging tracks. Stands up to temperature extremes of -50°F to +140°F. Bends if struck and springs back up. Low-profile, stands 10 inches above tie. Base of marker bolts to tie. Use to comply with Federal Regulation 49 CFR part 218.101. Note: Constant exposure to sunlight will not affect the physical properties of urethane except that there may be some color alteration over time. The marker will still remain a highly visible object in the middle of the track, especially in snow. Screw spikes and washers included. Weight: 5 pounds. Product of Aldon® Company.