I'm talking about the Power stutter in the HUD. Please tell me, that happened more than one time now and I don't know what this is. Happenes with PZB/AFB/SIFA on and off. And every other combination.
I'm not sure if it's exactly a bug, but what you're seeing is the locomotive having trouble applying that much power to the axles at that speed. It doesn't matter if you have PZB/AFB/or SIFA enabled/disabled. If you have more than 70% tractive effort while traveling somewhere between 30 km/h - 100 km/h, then the train will struggle and you'll have wheelslip (you can even see the red indicators in the HUD). This doesn't happen in TSW2020, but it does happen in TSW2 with the same locomotives, presumably after some physics changes. I'm not sure if this is prototypical to those units...