For some reason, even though some of my trains are able to transport era 5 goods such as cars, bauxite etc, my Career Engine is only able to carry goods up to copper. Is this a bug or is there something I need to do to somehow upgrade it?
I checked your data, and it looks like you only upgraded the goods your Career Engine can haul to Era3, is that Right?
The Career engine isn't affected by the coupling you Research ingame, the only way to Transport goods of later Eras is to upgrade the corresponding category with Career Points.
point taken, ty. i had forgotten about that .