Does cologne only have now car transportation freight trains please and thank you if you can tell me because I feel like I'm missing a few services
You may not have the correct Layers for freight on this route. I cannot remember which route you need exactly but it's either Main Spessart Bahn or Ruhr Sieg Nord.
I checked and the only thing I have available is car transportation freight services I don't have mixed Freight or tankers anymore
Is it possible that you're looking at the DB Red BR 185? That version of the locomotive only runs a few of the freight services on Koln-Aachen, compared to the Railion version which runs all types of freight services.
Even for the Railion 185 there are no Tankers, I have RSN & MSB & I've seen a mixed freight AI with tankers but nothing is available on the timetable.
I can confirm that could be a bug. You can switch between DB and Railion but there are no tanker and mixed. But there are on the route.