check the article on london "walk through" trains. these are the raceable ones - like in Melbourne australia. but Dallas trains are double decker - the idea is to race for a short distance then hit a flip trick or an ollie down the 6 or stairs. anyway check the article
so the term "walk through trains" is what appears to be the new name for the trains that you can race on
jedi has another theory though. the closed carraige trains like san fransisco metro can still be raced - you just need a friend to hold the doors open for you
also jedi will be train racing again soon. look out for the new clip!
http://citytransport.info/Walk.htmhere's the clip of the dallas train's
and here's a pic of the london trains - as i said - they r perfect for train racing