This set of four modules were made to sneak around a table at home, but at modular meetings could be configured as needed be. The short sides all have the same 'interface' (symmetrical along the vertical centerline) They are also an extension of the first module I made.
They are all constructed basically the same way I did my first module, so it's not as detailed...
Here is the thought track plan using Märklin C-track (WinTrack7.0). 20cm (8") grids
Plywood and styrofoam. WS tunnelportal. Planning for some signals as well...





Tunnelportal and retaining walls from WS

A searchlight signal (kit) from Oregon Rail
The hidden part of the tunnel are pretty simple ones with removable tops...





In case of derailments...



