An offshoot of another project - an "interpretation" of the D&RGW in Denver Colorado, and heading West into the FrontRange, and South toward Colorado Springs, with a connection East through the plains of Colorado toward Nebraska. Perhaps 1890-1920 time frame.
Just less than a 4% grade up and down the mountains to 8" in elevation. Around Denver there is a passing track and reverse loop connections, allowing a train to head out of the yard turning south, then into the mountains, climbing up and down, then back toward Denver. I imagine a couple of times around, then taking the reverse loop to change direction while passing the Denver yard, then a couple times around again in the opposite direction, and heading back into the Denver yard, where a turntable allows steamers to be turned and serviced.
The mainline is O-48 minimum diameter with O-60 turnouts. The yard has O-36 turnouts.
At about 14" in elevation is an On30 line, a figure-8 with spurs serving a couple of mines.
At the left there is a bridge for the Lionel Extended Truss Bridge. There is also a 10" Lionel Plate Girder Bridge, and a couple of scratch-built short bridges, and a nice curved bridge or tall trestle.
There are three of Lionel's animated cattle pens, the yard tower, work-house with sound, and the barrel loader. Then some OGR buildings including "Dot's Store". And some Menards buildings re-purposed. The mines are scratch-built, perhaps I will come across a kit or building that can be used.