This N Scale Cinder Bumper is based on PRR plan 70100-B and is designed to be compatible with all N Scale track. The product is intended to be coated with your favorite ballast/cinder product after installation. A score line allows for Atlas Code 55 track height with the un-cut product designed to fit Unitrak. Sanding off 0.3mm will work for Atlas Code 80 track. Some trimming may be necessary around your track underlayment product (cork, etc.) at the track opening. The wall inside is designed to butt against the end of your track for prototypical proportions.
The PRR designated this type of bumper for end-of-track that were not near structures or expensive property.