What is the 'tune' that plays when you reach a station on Berlin's Regional Express trains?

Question

I would love to know what the few notes are from that play on the train to announce the arrival at the next banhof. Someone told me they thought it was the Anthem of Brandenburg - any ideas?

Answer 1

It's a short melody taken from an old folksong (19th century) from the region, called "jetzt kommen die lustigen Tage" (something like: now the merry days are coming).