Even if you had a LEGO train set as a kid, I guarantee it wasn't as cool as this one.
Full disclosure, I had a LEGO train set as a kid, and I pretty much spent my entire time with it recreating the climax from Back to the Future Part III. Apparently I wasn't the only one either. This awesome Back to the Future LEGO train set comes from the Cuusoo website community of LEGO builders, specifically the Team BTTF Cuusoo community. People who like the set can use the Cuusoo website to voice their support for new LEGO sets, and the idea is that a Cuusoo project with enough support will get a real manufactured LEGO set.
Now I need to go fish out my old LEGO set out of the closet and relive the adventures of Marty and Doc Brown for myself.