From the Dortmund main train station, take the S-Bahn S1 to the North campus of the university. Change to the H-bahn, which travels in 10 minutes tact, to the south campus.
Take the U-Bahn U42 to the station "Barop Parkhaus" , from there, take the bus 440 direction "Oespel".
Alight at the station "Am Gardenkamp" , walk 5 down to the south campus(siehe Lageplan), or you alight at the next stop and change train to the H-bahn.