Since winter train season is here I started more work on the layout again.
I filled in around the turntable with PoP

Smoothing out the ground near the engine house...

Working on the rough-in for the Campbell timber tunnel portal....




Ground cover added to the yard/turntable area...



Continuing around with some new terrain base, here's what it looks like before the construction starts...


Some pink foam sheet for a base...

Some risers underneath to give support....

Terrain form added with crumpled newspapers backing up plaster cloth strips....

The small flat area near the tunnel portal will be for a future gas station.....

Not sure yet what I'll add to the 'flat surface' but I have room to grow now.