I don't know about the BD BR 101, but the DB BR 101 layers onto Hamburg - Lübeck, for 2 services, not sure about any others.
Also, it will layer on Riesa Dresden, but the 101 is one of the, If not the best locos in TSW, perfect sounds and looks. And it makes HRR (which is required for the 101 to work!!!) very busy. I absolutely recommend it. Also taking it on other german routes with the scenarioeditor is very fun, it just fits anywhere.