The Steam Train tour was awesome!
Just a disclaimer here. All the photos I'm posting are "legal". Even though some are backstage, we were told that these are allowed by Disney so no rules are being broken here. 
Our tour guide was an engineer named Joe. He was a lot of fun and was a great guide!
After this tour, I had a new appreciation for steam trains. I couldn't believe the amount of work that's involved in running one. It's just amazing.
First, one of the trains pulled up to the main station and the engine stopped short of where it normally does just for us! It was for a photo op, so of course I took it!
Next, we boarded the train. This train has specially modified cars that don't have a rail along the left side. This is the one they use for the characters to greet the public when the park opens. We took this train to the back of the park, then switched to a spur line and went backwards all the way into the round house. The train then dropped us off and headed back to the front to get ready for opening.
The round house area is actually not round at all. It's a giant service complex. Steam trains on ground level. Monorails above. And the Disney buses have a service depot right beside it.
Inside the train service bays.
This is a newer "tractor" that they have which is used to inspect the tracks.
That's the Disney bus service center in the background.
Some photos of the train that we were learning about.
Me and the locomotive! 
Jan got to sit in the "fireman's" seat. It was VERY hot in this cab. Joe said it gets up to 120F in the cab!
Some gauges inside the cab. The big one shows how much steam pressure there is and they have to maintain it very closely.
The view from the window.
An finally, this is how they "light up" the train. They use a cotton type material and throw it in the fire box where the diesel fuel is.
I took more pics of the tour, but these represent what we did. We had a great time and I'd recommend it to anyone half interested in trains.
