Mmmm on past experience, not very easy to come by.
I'm not sure why. Whether it's because the Bachmann 20 footers have been G Scale's best kept secret, or whether the purchasers of 20 footers are more careful than anybody else and don't break/bash them, I don't know.
Also, the 20 ft wooden bodied ore hopper has the normal 30 footer bogies with 31mm wheels.
I'm off to count some more rivets.................. :callme: