The two Maine foot gauge baldwin forneys that are around now, B&SR #s 7 and 8 (famous from their work at "Edaville") would probably do about the same, but they have 35" drivers, and walshaerts valve gear. They are a tight design but the large ones characteristically (or at least the ones operated and Maine, can't tell you about ones in other parts of the country) have serious problems keeping the crossheads centered. This problem is worse on 8 which is 5 tons heavier than otherwise similar 7 which has the same bore and stroke (the same cylinder casting for the most part). The consensus is that the main rods weren't long and rigid enough to provide proper support for the pistons. I still like those forneys a lot though, and they are a lot warmer in January when you can fully enclose the cab!
It's very interesting posting here. All the D&RGW guys claim that going 40+ on an outside frame engine is extremely scary, while they think nothing of going 60 in a T12. On the two footers it was just the opposite, the outside frame engines felt secure at high speeds, and the inside framed engines were the thrill rides!
Regards,
Trevor H.