Dortmund - Hanover would also be a very nice route for TSW, you could use ICEs like the ICE1, ICE3, ICE T and if it comes maybe at some point also the ICE 4 but you could also have regional trains run there like on the RE1 the Desiro HC which could run from Dortmund Hbf- Hamm (westf) Hbf, as well as on the RE6, which could run from Dortmund Hbf to Minden (Westf). On the RB69, which can be driven from Hamm (westf) Hbf to Bielefeld Hbf, you could use the BR428. The BR101 could also be used as an IC from Dortmund to Hanover, as well as the IC2, which is pulled by a BR146.
