Yeah, it does make sense the way it ends. But it's just so sad after seeing how they got together in route 65! Also very sad when Chase visits Leo two years later, he just seems totally broken! Like he's only living and has no hopes or anything to look foreword too! He says he's getting better, but he doesn't enjoy his life and seems he would just end up some old hermit all alone!
No the guy did not survive! A good reason I'd never have tried getting on that train in Echo!