After seeing (and hearing) the trains chug down the tracks, I got a chance to go behind the scenes and see where they are made and stored. Believe it or not, they are hand-crafted here by staff. There is a little workshop just off the exhibit where Carnegie staff create the mini Pittsburgh that, I should note, is here all year round.

While the entire display is fun, I recommend hitting the button to make the train whistle blow. I might have done it a few -- seven -- times.

It's time to get rolling (I had to) and see the robots. I'm told they are pretty smart and one is even better at basketball than I.

Before we get to the real science stuff, I had to check out the huge train display at the Carnegie Science Center in Pittsburgh. If I behaved I was promised a meeting with some famous Star Wars robots.

Take a look at the sprawling display of electric trains that zip through the "city" all day long -- literally. The lights go up and down so it's daytime and nighttime as you walk through the exhibit.