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If you set up an industry to accept the commodity Wool Bales and produce the commodity Textiles and set up a box car to load and unload both then those settings are stored in the Session, not the Route, even if the industry and box cars are part of the Route. When you save your work if you save only the Route and not the Session then that data will be lost and the industry and box cars will revert to their default settings, whatever they may be, when you reload the Route. Saving (and backing up) the Session will save those settings so when you next load the Route and the Session then your settings (Wool Bales and Textiles) will be preserved.
The same is true for a long list of other characteristics. An incomplete list would include:-
Weather and environmental conditions
Time of Day
Rules
Driver assignments
Driver commands
Commodities consumed, produced and carried (as described above)
Switch settings (left or right)
Anything stored in Session Layers
You can load and run a Route without also loading a Session and the above will all be set to their default conditions except that anything that was in the saved Session Layers will be missing from the layout.
Ok......great......thanks.JimDep - Yep; copying the entire contents of both your T:ANE Program folders AND T:ANE UserData folders constitutes a reliable way of fully backing up your Trainz routes and sessions.
In most cases, however, you can get away with simply copying the entirety of your UserData folders and files, since the Program files won't change too much between sessions, unless you have patched or otherwise updated them.
CDPs - of both the underlying route and its dependent sessions - are a good a good way to back up individual saved sessions, something I always do after making any significant updates to the session (or route design) during development phases.
Saved games, of course, will be preserved when you fully COPY both program files and UserData folders.