Why is there no direct IRE from Stuttgart to Mannheim?

Such a line would make a lot of sense. After all, these are the two largest cities in Baden-Württemberg! You don't always have to take the detour via Karlsruhe with a change of trains. You also have to change trains once via Heilbronn, and even three times via the most direct route! I would imagine…

Kvv and IRE?

Hello everyone, for two days now I've been trying to figure out whether I can travel on the IRE with a regular kvv ticket. For example, from stop X to Vaihingen (E). As far as I know, I can travel to Vaihingen (E) with a kvv ticket, but it doesn't say anywhere whether the ticket…