Actually, I don't believe they ever referred to Stealth as a 1st Generation- I believe they always referred to it as a prtotype. Therefore, X-Flight and Batwing are first-gens. And Originally on stealth, they wanted the trains to recline on the lift hill. Unfortunately, they couldn't get them to do it, so they changed it to make them recline in the station. I guess they worked those problems out!