Service scheduled departure 15:37 Petroleum Hagen-Freight yard to Wuppertal Langerfeld has a train weight of 1878t. It is pulled by a Br185.5 engine. The first grade, 1.9% I survived, but then for the long wind of a 1.7% grade, it starts dropping speed. You cannot apply more than 75% power, that causes wheelslip. I drive in journey mode, the weather is good. DTG JD and DTG Matt please do something about this. What makes me angry is not that I cannot complete this service, though I paid for this, but the problem is after some time I forget you cannot complete this and I try again to fail again. So either get it solved ASAP or make it possible to to mark a service as not runnable. The latter would make a good way to report bugs. This really sucks about this game and is very annoying.
I can totally understand you, it bugged me, too. To get through and continue the journey I uncoupled the last three tankers when the run started, sad workaround:-\
I remember completing this one. I disconnected some of the waggons to make the load lighter before setting off. You do get an invalid consist message at each checkpoint, but it will allow you to complete the journey.