Hi, Our cofee table layout has progressed to a stage where we need to start making scenery. I figured a wise place to start would be the tunnel portals... Are there any NMRA or otherwise regulations that should be followed? "Just make'em big enough" ? Could someone measure a commecial tunnel portal for steam/diesel loks so I would have something to go on, please? Threre will be 3 single track portals and 2 double track portals... I think we may have gone overboard with the tunnels.... This is our first attempt at model railroading so any advice is welcome. btw. "we" means me and my wife... I attach a pic from the mock up of most of the scenery elements, what is missing is the Wineyard/mountain on the right that will enclose the tracks.