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if you go out of the stadium immidiately after end of match you will have no problems.
usually the tram needs 15-20 minutes, but sometimes it takes longer ...
How many of you is there?
Don't forget that you don't have to buy individual tickets for everyone. I don't know how much you know about German Train tickets so I post this anyway and hope you get to read this: You can buy the "Niedersachsenticket" which cost 29€ I think and is valid the whole day for up to 5 persons. It's valid in all regional trains in Niedersachsen, Bremen and Hamburg.
There's also the "Niedersachen-Ticket Single", 21€, valid for one day for one person.
Don't forget that there's no drinking alcohol in the trains between Hamburg and Bremen. I've seen lots of fans ignoring/forgetting/not knowing this having to pay incredible fees or being thrown out of the trains
Have a good journey and a nice match, IF you got tickets