I now from the real world driving in a loc (db br 185/189) that the cab is bumping left to right and up an down a little bit. In the simulation the cab seems to be standing still. Further what graphic card needed ? Find it not that easy to deal/operate in the simulation. Now i am looking for the db br 155 loc add on and do all scenarios, but can't find all scenarios ? Frustrating affair...
It may be that cab roll hasn't been simulated on that route or train. Some of the older routes were like snooker tables in that they are completely flat. Don't know what route these come with but that's where I'd start. Look in both career and standard scenario sections
TS will run in a machine with the basic Intel onboard HD chipset but that certainly isn't recommended. Any discrete GPU will make some difference. TS doesn't have great support for modern hardware as the DirectX 9 spec' indicates so a second hand card could still be a good option if you're watching the budget. The BR155 is included (in a choice of liveries) with Köln-Koblenz.
If you look on RailSim.de you will find a lot more scenarios for the BR155 and other liveries https://rail-sim.de/forum/wsif/index.php/CategoryList/ Peter