Well perhaps more of a molehill than a mountain, with little space and everything visible all the time, creating a scenic break is a challenge. Solution, a central mountain offering a rock face on one side and a scalloped clearing on the other for a different point of interest. 

This is a first draft from a piece of packaging foam salvaged from a skip on site at work. 

Remembering from the first post, the loco will be staying still with the mountain and track rotating, so the train will always be at the front with the scenery changing behind it.