Can anyone direct me to plans or a picture I can scale of a narrow guage wooden tunnel portal?
Doing a search on google brought up the following:
http://www.ebepe.com/html/mariazell2.html Stone and Concrete only
http://www.narrowtracks.com/minibunch/articles_prototype/Views_Along_OR&W/2002-08-PerryopolisTunnel.htm wooden tunnel portals as required
http://ghostdepot.com/rg/mainline/tennessee%20route/tennesse.htm More pics of wooden tunnels!
Hope this is what you were looking for.
Ian