Almost got it, Jamie, but not completely: the "Main menu" button is at the top-
left of the screen.
Casper: I'll hop into Trainz right quick and check that out, and post back the result.
EDIT: Surveyor shows the "Do you want to save changes..." dialog even when I only open the edit environment dialog. Changed the time to a darker time, and the save dialog's options only involved the session. Alas, it was daylight when I re-opened the route/session.
TS2010 does have the "Session Date" feature, which allows you to set what month, day, and year the session (?) is set in. I tried changing the date on the Session Date calendar then changing it back, and changes to the time are then retained. Surveyor also saves the route as well as the session when this is done.
So I guess that the need to change something before the time will be saved still exists in TS2010, but there is/are other way(s) to go about making such a change (such as changing the session date then changing it back like I described above) that do not affect the objects, etc., on your route.
Regards,
Retro.