Just wanted people to know if you switch operating cabs or before leaving the yard with a train go into the trailing units including the DPU's and make sure you switch the switch to the up or cut in position or you're not going to have dynamic brakes on that engine or be able to engage them at all if you switch cabs and don't put the switch up.
Yup this caught me wondering why the engine throttle up but no power input at all to the motors. Finally found that switch and get going. Should be mentioned in the tutorial