The musicians took a special train Wednesday from the Olympic Stadium, near the western end of the U2 line, to the Deutsche Oper stop. Local radio station Radioeins, which gave out tickets for the ride, said about 120 people joined them on the train.
Bono and The Edge played a few songs on the platform at Deutsche Oper to wrap up their appearance, which follows the release of U2's new album "Songs of Experience."
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