(14" WIDTH x 8-5/8" DEPTH x 15-1/2" HEIGHT x 8" Clearance WIDTH x 11-1/2" 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