Not sure what "era" you'd like to model (saw your engines and you kinda have some of everything!).
First thing that comes to mind on a long skinny bench would be a pier with a coal loading arrangement for the old days (barges with full cars), or container loading crane for more modern times.
Since part is against a wall, you could also do something alongthe lines of a busy "downtown" industrial switching yard with lots of businesses and a background "facade" of building fronts & mirrors to create additional depth of field.
The old standby of a lonely mine and rough terrain usually works.
Same for a rural logging line, or maybe an oil refinery with tons of complicated piping right up front where visitors can enjoy the fine detail.
Or you can put the whole module on a "rotissary" and model TWO of these ideas!
Go nuts! (works for me)
I can feel my sanity slipping... I think my brain needs traction tires...
Been there, done that:
O, S, HO, N... not going any smaller...