score:7
By regulation no. For the online ticket, the ticket has an owner (you) that needs to be present with the identification card for the ticket to be valid:
Online-Tickets are non-transferable and are only valid for the person named during booking (and travellers accompanying them, if applicable). The tickets are valid only in connection with the traveller's selected identification card.
In practice, they swipe the card and if it's not entirely obvious that the wrong person has handed them the credit card (e.g. obvious male name on card given by a female person) they most likely won't notice. Doesn't make it legal though.
Upvote:5
The rules concerning this question have changed as of 1 October 2016 and Deutsche Bahn no longer requires an identification card but only an official identity document (or their Bahncard).
Per their help pages (in German, I was unable to find an English version)
Ab dem 01.10.2016: Identifikation per amtlichen Lichtbildausweis
Bei Buchungen nach dem 01.10.2016 entfällt die Angabe einer Identifikationskarte. Bei der Kontrolle im Zug müssen Sie sich dann lediglich durch Vorzeigen eines amtlichen Lichtbildausweises oder Ihrer BahnCard legitimieren.
Folgende Lichtbildausweise werden anerkannt:
- deutscher Personalausweis
- deutscher Reisepass
- Kinderreisepass
- europäischer Personalausweis
- internationaler Reisepass
- elektronischer Aufenthaltstitel
- Bescheinigung über die Meldung Asylsuchender (BüMa)
- BahnCard (ggf. in Verbindung mit einem Lichtbildausweis)
Es gelten nicht: Führerscheine, Schülerausweise, Truppenausweise und Schwerbehindertenausweise.
which summarizes to what I have stated above. The man in seat sixty-one has already reflected these changes:
If you wanted to use a German Railways print-at-home ticket (shown as online ticket on bahn.de) you used to have to show your credit or debit card as I.D. on board the train. I'm glad to say that this changed in October 2016, all you now need is a passport or other recognised ID to prove your name to support a print-at-home online ticket. You may or may not be asked for it by the conductor.