I think I'm in the minority but I didn't like it that much and it wasn't really what I was expecting. The biggest thing is I thought you got to go into the roundhouse, but you don't, you just stand outside of it while they give individual tours of the engine cabin area. It didn't help that it poured on us the whole time and it was pretty cold.
The tour was also given by a tour guide, not an engineer or maintenance person.
I am a mechanical engineer and understand steam engines pretty well, so I probably had different expectations than most people. I thought it was going to be in the roundhouse and discuss their upkeep much more and be given by someone that actually knew the trains.
Edit, I don't want to sound too down on it. I think I would've still done it if I knew what it really was, but my wife would've probably skipped it. I don't foresee myself doing it again, though. I am also a tightwad, so $54 is a lot of money to me

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Seeing main street and fantasy land with literally zero people in them was pretty cool though.