You can take any New Jersey Transit train on the Essex County Line from Penn Station to Broad St. Newark. I think the stadium is a one block walk from Broad St. Station.
Thanks for the info. BTW, Would you happen to know how late the trains run back to Penn Station? Just want to make sure I'll be able to get back after the game.
Last train leaves Broad St. at 12:08 AM. The game will be long over by then. http://www.njtransit.com/sf_train.shtm