The freight system is weird. Sometimes towns stops accepting my service and the game ai starts delivering goods from the same factory. It helps sometimes if I create new depot to another spot and reroute my trucks to it, thats how I get the service running again.
I rarely use trains for freight because I cannot get factories to produce enough cargo to make lines profitable. I dont know if I make something wrong or what that is. But the freightsystem needs some working imo, I’d like to get those long freight trains delivering stuff. Also that makes me wonder if the values how much goods towns accept should be increased? It is quite low and easily maxed with few trucks