I love the Br 143 & Br 112 Trains irl and in the game but the issues I have with the train is the constant annoying wheel slips everytime you press the throttle for the Br 112 to move it has this bad Jerry wheel slip and it does it the whole time while trying to reach a certain speed.The Br 143 also has this issue but DTG low-key fixed it but it still does it hopefully they can update the 112 where it's not doing that constant wheel slip.
Decrease the force selector. If you keep it at 100%, you'll get too much power applied and get wheelslip. Bring it down to like 75%.
Drop the force Selector to 70-99%. Remember using 100-120% force Selector all times you will need to use Sand from time to time