Guys, What do you guys do inside your tunnel entrances? How far up do you ballast/weather the track and do you enclose the area inside the entrance? I've heard that crunching up (then flatenning out) aluminium cooking foil and painting it black and lining inside the tunnel entrance makes for a good "rocky" look when you look up the entrance. Wouldn't that puncture easily from derailments or extraction attempts of derailed rollingstock? The first bit of landscaping Garahbara is gunna be "over the back bit" when the mainline exits a tunnel and rounds a riverside embankment.