Would it be acceptable to say "These train stations are not large?" or is there a differentiation in Hungarian between large and big?
No, it's correct as well.
[EDIT] -- oops, I missed what Cat.e.rina noted: these can't be used here. But "big" and "large" are both nagy.
please tell me why "those are not big railway stations" is not acceptable? Thanks
These are two different sentences in Hungarian.
Those are not big train stations. = Azok nem nagy pályaudvarok.
Those train stations are not big. = Azok a pályaudvarok nem nagyok.