Railroad derail gate used to alert train crews to engaged derail on track. When derail is engaged, signs swings out over the gauge of the track. Mounts to hi-stand style square (Racor) or round (Western-Cullen-Hayes) 1.25" masts. 1 3M High Intensity Prismatic reflective sign (10" Derail Round) included that mount to end of gate over gage of track. 98" Length Gate, extends up to 110".