There's a train museum in Duluth MN that houses the last steam emgine to haul iron ore from the quarrys to the ore docks in Duluth. It is so long, it has 2 engines and 16 drive wheels under 1 huge boiler. The front engine being able to articulate to navigate the bends in the track !!
Link to musuem website. Scroll down near the bottom for Engine #227