I tried playing the scenario after downloading from the forum and when using the two modern EU07 was never ablet to get the second unit to apply power. Using the passive switch on the trailing locomotive in the on or off position did not matter. I then tried using the version of the scenario from Steam and was able to get the second unit to apply power but only if I did not switch the passive switch on in the trailing locomotive. Not sure if the passive switch is functioning correctly? I got stuck at a red signal (S: katowice_lazy_terrain_x-14_z2, P: (-6864.63, 265.51, 1490.47), R: (10.01, 263.58, 359.03)) and was unable to complete the scenario.
When I tried running the scenario using the ET26 (Heavy unit cargo, 3282 tons, 747 meters, G brake, cargo DLC) once I connected to the cars, I was held up at a stop signal before LB and never given permission to proceed. The dispatcher gave message saying he could not allow trains to proceed early.