B&O s-1 2-10-2 big six

[train guy]

Can a bachmann 2-10-2 be turned into a baltimore and ohio s-1a big six?

[ebtnut]

There's a good thread on this exact discussion under the General category.  Short answer - You really need a Rivarossi loco for the boiler/cab assembly and the drivers in the Bachmann model are too small for an S-1 (58" vs. 64", as I recall).  The driver size is OK for the earlier Class S.  the IHC 2-10-2 is a better fit.