California has the longest light-rail line in the world. It doesn’t quite work
(www.sfchronicle.com)
i feel you're missing one half of the equation here.
So we got 40k people that want to go to dodgers stadium. Where are these 40k people going to come from? The forum? LAX? The rose bowl?
No most of these people are going to come from home, and if you don't have the train by a neighborhood, its more discouraging to take the train than just driving.
Part of the issue is that LA doesn't build dense housing as well. The neighborhoods that trainstations stop at should be very dense so you can remove the need to drive places, but LA/US zoning is very bad. Thankfully SB 70 (name may be incorrect) will help with this issue.