Is it brand new, or new to you. The reason I ask is, that it sounds as though it has EM gauge wheels on it if the axles are longer. You should be able to get new wheels from either Bachmann themselves, or some really nice ones from Ultrascale at Letchworth. If you decide on Ultrascale, be prepared for a wait.
On the other hand, it may just be that it's been re-wheeled and the wheels have been fitted further out on the axles: if this is the case, then you'll be able to re-gauge it to 14.5 mm by simply pushing the wheels back in.
Are you sure it's been fitted with fine scale wheels, as modern stock does have much better wheels than the old stuff.
Edited to say,sorry, welcome to the forum.
On the other hand, it may just be that it's been re-wheeled and the wheels have been fitted further out on the axles: if this is the case, then you'll be able to re-gauge it to 14.5 mm by simply pushing the wheels back in.
Are you sure it's been fitted with fine scale wheels, as modern stock does have much better wheels than the old stuff.
Edited to say,sorry, welcome to the forum.