Actually,it might be fun to take a couple of Monogram(or whoever makes 'em now) Big Boys and make a whimsical 4-8-8-8-8-4.
There was a seven cylinder Steam Motor Compound Locomotive built by the German Reichsbahn before the End of the Worldwar II as experimental Version. It were given as reparations to the US Forces who delivered it to the USA and tested it in running them onto US Track in Service by the Union Pacific, but that Loco had to many axle weightand destroyed the US Track shortly so the Union Pacific removed it from Service immedietly and trashed it after a few years after they asked in Germany if anyone of the Museum Foundations would be interested to get this Loco back. The Freight costs were to expensive at that Period of time that this Loco was trashed in the USA in the 1950’s.