I have these same missing assets. I checked to see if I have those two flatcars, and I do. I checked the config file on both, and they do list these unknown and missing assets as commodities. I cannot find where to get them anywhere on the internet.
Could I just edit the config to delete those entries under "allowed products" to clean up the session?
EDIT: So, I did that for those two cars, and then removed those entries from the kuid table of the session, and that seemed to fix it. Showing no missing dependencies now.
Glad you fixed things, Griphos. After numerous filtering of dependencies and dependants, I think I got those commodities when I purchased the Fall Harvest-Harvest route. If a person has that route then I don't think there are any problems with the cars but if they don't, well, then they might have to do what you did.
Again, it's disappointing that a car on the DLS has a "built-in" commodity that is not available to everyone. I try to make sure the sessions I build are accessible to everyone but seem to fail in some way every time. Thankfully, a lot over clever folks out there help to fix things. The problem is that there are a lot of Trainz users that don't have the knowledge or don't want to take the time or whatever to fix the sessions and just give up when things don't work correctly. Can't say that I blame them a bit either.
I've learned to expect the various problems and try to foresee the most obvious ones but am continually surprised by new ones all the time. Will I ever build a sessions which will work the first time for everyone? Nope. Not going to happen with the almost limitless variety Trainz builds, content, computer rigs, etc. When I put out a session, I now know what to expect so I don't get too excited anymore. I just get T:ANE's CM fired up and start working on what's going on.
But most everyone will notice that, as long as the cars are in the route, all the sessions do "work". I.e., the instructions, nav points, etc. are correct and the sessions proceed to the end. I test the sessions after even a minor change of nav points, new tackmarks or cars because an error can creep in that blows up the whole session. I have sheets and sheets of instructions for a session and it still takes numerous modifications to get everything to "work" correctly. And, yes, I can get sick of even the best route after the numerous run throughs of the session. One of the big reasons I limit, to some extent, the length of the sessions is the testing time needed. Anything over an hour and I start losing concentration and start making stupid mistakes (speeding, wrong switch throws, etc.) after the tenth run through. Oh, it's been live and learn.
Take care and have fun with the sessions,