+--------------------------------------------------------+
| |
| |
| +-----------+ |
| | v v
+---------+ +------+ +-----+ +---------+ +--------+ +--------+
| Koblenz | <-- | Bonn | --> | Ulm | --> | Bautzen | --> | | --> | Kassel |
+---------+ +------+ +-----+ +---------+ | | +--------+
^ | | | | |
| | | +-----------> | Berlin |
| | | | |
| | | | |
+---------------+------------+ | |
| +--------+
| ^
+----------------------------------------+