AN expansionist query if ever there was one.
Why bother creating something around a hyperthetical reference standard when the real issue is- will my N-Scale locos that I have be able to pass?
What is wide? Wider than what? Prototype? Other models? Outrageously proportioned?
And why is it that only locos are being considered? Other rolling stock could be over sized/ out of proportion too.
Regds
dave