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. All materials are strip basswood and include Nut/Bolt/Washer
castings. Full-size templates are enclosed for various clearances: 16' wide for
standard NMRA Specs; 14' and 12' for Narrow Gauge layouts.
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