Try the following tour, recommended by residents or metro enthusiasts:
For some interesting stations, ride line U43/U44 between Unionstraße and Ostentor and change at Reinoldikirche. Take line U42 to Möllerbrücke. To get to the H-Bahn suspended monorail, take line S1 from Hauptbahnhof to Universität.
Other Rail Transport in Dortmund
S-Bahn (suburban metro) H-Bahn (suspended monorail at university site)