(16-1/2" WIDTH x 10-3/16" DEPTH x 18-1/4" HEIGHT x 9-7/16" Clearance WIDTH x 13-9/16" 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