Locomotive servicing terminal
As I like steam engines, and have quite a few of them, a servicing terminal with turntable and roundhouse is an obvious feature. The idea is to turn part of the servicing terminal into a museum, so it fits in with the modern rolling stock as well. Japan still has many functional steam locomotives running as event trains, so it's not uncommon to see them running next to modern trains.
The module will be split in 2 parts to be able to give it a reasonable size and give it some interesting operating possibilities. The turntable used will be the one by Tomix, although I have no idea as of yet how to operate that one with DCC. There will be various tracks for storing old locomotives and cars for museum use, as well as a larger track to store a worker train / rescue train.