O Scale Modular Tunnel Portal for Lionel or MTH Trains

This is a tunnel portal for O Scale Model trains like Lionel or MTH. The exterior dimensions are based off the MTH single and double track tunnel portals. The internal dimensions have been expanded to give more room for trains when the portals are installed near curves.

This is a modular design that can be printed on smaller 3d printers like the Davinci Mini. The internal dimensions of the portals when assembled are:

217mm double track width ~8.5 inches
127mm single track width ~5 inches