@Kewpie said437
Perhaps I've been awake longer. It's midnight here. 😉
436 is (2*2) followed by (2*2) times (3*3)
4+3=7
A 4-4-6, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with:
four (4) leading wheels (at the front of the locomotive)four (4) driving wheels (2 axles) fixed in a rigid frame, andsix (6) trailing wheels (normally mounted in a trailing truck).4-4-6 locomotive
The only example of this wheel arrangement was the Thuile locomotive.
^wikipedia^