By the number, this is a 4-8-2 "Mountain", built by Baldwin in 1921. If it was all there, it would weigh over 352,000 pounds! After this rebuild, 3733 went on to hit a "Caterpillar shovel" in 1945. It was scrapped in 1955.

When I was a little girl way back when, these types of very large behemoths scared me to grabbing my dad's pants leg and hiding behind him shaking like a leaf. I couldn't get away from them fast enough. ;D My dad was a diesel mechanic the majority of his working life and he worked on some pretty big machinery. It always scared me silly. Looking at these pictures still has a bit of that effect on me. It's almost as if it has turned it's head to look at me and say "BOO!!!" I hope the train never fell on anyone.

It looks like a gigantic Praying Mantis with its small head on a large body turned almost 90º to look at us.

Steam does tend to rise.

as a "heavier than air" conveyance.