ASME on 611
Interesting reading on page four.
"Under test conditions, the “J” propelled a 15-car, 1015-ton passenger train at 110 mph on level tangent track. Performance in regular service was equally impressive, with speeds on straight sections of track reported to approach 100 mph."
"A unique side-rod-and-driver counter-balancing design, in conjunction with stiffened centering of the leading and trailing trucks, permitted speeds in excess of 100 mph with drivers only 70 inches in diameter, performance unequaled by other steam locomotives. According to vibration calculations, the balancing theoretically would have allowed speeds of up to 140 mph without the rail damage that could have occurred with conventional designs."
A circa 1959 Trains magazine article spoke of 100MPH running of 611 on the final steam powered N&W passenger excursion run.
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