The number you found is an automated timetable enquiry number - from the description it sounds like it's a robot service.

There is a customer service number which is 11861 - it only works from within Germany so not a lot of use.

Your best bet may be the Deutsche Bahn office in the UK whose number is +44 871 8 80 80 66. This should work from abroad, though it may not work from all networks.

Alternatively there is an English-language webform at

http://www.bahn.de/db_uk/view/contac..._enquiry.shtml

(I have used the German version to contact Deutsche Bahn, and they have always replied)

Can't answer your specific question, I'm afraid - but hopefully you'll get a definitive answer from DB