I’m impressed by the critique here. Begs the question if there exists any appropriate scale engine for the n gauge dynamo envisioned? Would an engine robust enough for the task appear outsized in the role?
OR
Can sufficient mods be made to do the trick?
I run two N scale trains (5 cars each) along with several other accessories simultaneously using a stepper motor generator turned by my Jensen 51 replica. Big engine granted, but if an engine can spin a stepper motor (scrapped from a computer printer)... it should easily power your N scale layout.
Rog