I've been reading the ideas for the challenge with interest & have come up with an idea. Now, should I build it?
The space limit stopped initial ideas of a section of main line & the like (I'd want to run things on it!) so I have gone for a long since out of use section of track in Mistley, Essex. Mistley is a small port on the Manningtree - Harwich line that lost its connection to the line in the 60's. However, as is the case with many docks, the tracks are still visible in the dock side. Indeed they can clearly be seen on Google Maps:
My link
Mistley has a nice collection of maltings and warehouses that a rappidly being turned in to flats. The idea is to feature a spot where the line goes under a loading hopper inside a building. I'll post up my picture of the site later.
I have started sketching things out, so i'll post some updates as it goes.
Ivan