Pitkin - your example introduces a non-train edit which isn't possible under the old system. Under the old system you would have to make a note of where to place the tree, save the game, exit, edit the route, save the route, reload the session and the tree would be there.
Under UDS you just save the edit to the route layer and "Do not save session". If you want to have a session without that tree for some reason, save it to a new route layer and hide that route layer in your other session. I think this covers your goal here doesn't it?
Anyway, I've now got enough information (I think) to review the whole process and work out with dev the best solutions.
Meanwhile, I hope people understand UDS a little better now and can see that it is possible to save your sessions without stuffing up the starting positions (or save them as a progressive session).
As I have said, UDS is ok for editing routes, not sessions in general. In any case, I am with the folks who want to bring Edit Trains back. And, no, it does not cover my situation. As I stated earlier, I cannot save a new route. Other than personal preference, I develop sessions for uploading with routes on the DLS that are not my own. Even if they were my own, many creators want to develop new sessions without uploading a new route. Also,the solution does not preserve new session layers.
Anyway, I appreciate your acknowledging the problem. I hope your looking into it has results.
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