Radler is a German drink. Normally pilsener with fanta. It's been around for ages. Then these fuck wits jump on the band wagon!
If you go to any bar in Germany and ask for a Radler, thats what you'll get. It's what they drink on a hot summer day, to quench the thirst, before you have a real beer. Obviously some DB 'person' has been there and thought, 'we'll have a bit if this'.
Jeez, they piss me off. Shit beer, no clue and too much power=FUCK WIT.