Scale: TT Drawings/Templates ONLY
(2-13/16"max.WIDTH x 1-3/4"DEPTH x 3-1/8" HIGH x 1-5/8"max.Clearance WIDTH x 2-5/16"max.Clearance HEIGHT)
This design was used for tunnels that had problems with falling rocks.
It can be made with or without the front braces, and adds a superb touch
to any layout. Full-size templates are enclosed for various
clearances: 16' wide for standard NMRA Specs and 14' for Narrow