One-Way Portable Derails Left or Right with Sign Holder

One direction derailing for use with 4-axle and 6-axle locomotives and all freight cars.
For use on wood or concrete ties. Do not use where speeds exceed 10 m.p.h.
U.S. Pat. # 7,753,317
Features:
Lightweight: 46 lbs.
Tool-Free Installation
Safety Anchor Hook
Do not use where speeds exceed 10 m.p.h.
Fits rails from 90-142 lbs./yd.
Tie Spacing: 18″- 24″ on center.
Blue derail sign and holder are included with all derails.
Sizing forms must be completed and submitted within 48 hours of order to ensure prompt delivery.