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Old 02-05-2017, 02:57 PM
scr4 scr4 is online now
Join Date: Aug 1999
Location: Alabama
Posts: 14,115
p.s. Turns out there's an even more extreme example - the Bristol and Exeter 4-2-4T with their 9-ft diameter drive wheels. ETA: Ninja'd!

By the way, it's exactly the same reason why early bicycles (penny-farthings) originally had large wheels. The legs can only turn the wheel so fast. The larger the wheel, the faster you go. (Though in case of the bicycle, an equally important factor was that a large wheel makes the ride smoother. The invention of the pneumatic tire and the chain drive removed both of these factors.)

Last edited by scr4; 02-05-2017 at 02:58 PM.