I've got old Jackson films of a 470 getting balanced on the Durango table as it was still and "armstrong" table back then. If I recall, the tender was pretty close to the end of the table. I don't think a 480 will balance on a 65' table as a 480 is about 62 feet long. Even with the tender just clearing the edge of the table it would overbalance to the front of the engine. a 490's shorter length would help the balance problem, but I bet they didn't balance well either.