Interesting, in NZ the "Big" trains were the KA class.
My Dad was a driver and me and my older brother did get to ride on them (on night runs.)
I checked spec's with the US "Big Boy", wow the Big Boy is 3 times the size of the KA and (to a little boy) the KA's were huge
Big Boy 762,000 lbs
KA 208,320 lbs
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