190505 1735 UP Rock Springs, WY 4014

Ever wonder what those numbers under the locomotive number on the cab of the Union Pacific steam locomotives represent? If yes, well here you go:

4-8-8-4 - wheel arrangement

1 - series (group 1 4000-4019)

68 - driver diameter in inches

24 - cylinder diameter in inches

32 - piston stroke in inches

540 - locomotive weight on drivers in tons

DB - stoker type

Done