Sayeth Agent at Clicquot:
"If I were to restore the 1604, I'd form a corporate parnership with a mechanical engineering firm. I'd look to find places where material (eg weight) could be removed (or replaced with lighter materials) without significant penalties to structual integrity or adhesion. Given the advances in computer design, it should be possible to redesign and rebuild an H8 to operate anywhere UP 3985's weight and axle loads permit."
Sorry, Agent. The first ten Alleghenies weighed 778,000 pounds, with an average driver axle loading of 80,000 pounds. The engine weight was 6,000 pounds more than the Big Boy 4-8-8-4. It would not be possible, even using the most modern computer design methods and technology, to remove 150,000 (+ or -) pounds of engine weight from the 2-6-6-6 to make it the same weight as the 3985.
Oh, I guess it could be done; you could thin down the boiler plates and steam it at maybe 150 PSI instead of 260; you could shave weight off the cast bed frames because you wouldn't be transmitting as much power; you could cut weight off the main and side rods, and thus driver counterbalances, for the same reason. But then you'd have a caricature of an Allegheny - nothing like the real thing.
The 1601 and 1604 are where they belong, and where they'll stay. I doubt if any railroad would subject itself to the weight and axle loadings of these monsters.
But dream on . . .
ek2179