N Scale Tunnel Liners

This printable is a set of modular tunnel liners for N scale - effectively they make a solid tunnel that allows to easily build scenery over them without causing damage to track or tunnel.
The liners have been designed to work with Woodland Scenics N scale cast plaster single track tunnel portals. The size of the portals is enough that Viessmann hidden track catenary (brass strip) can be mounted using separate mounting blocks.
In practice these portals and liners are large enough to take long