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yes, but I'll lose the trains possitions if I play the new layout
When you say that you "saved your session" do you mean that you saved the current game in Driver - e.g. with the trains in their position after, say, 30 minutes of play? Did you then go back into Surveyor and change the layout by adding a house and then re-entered Driver to continue the previously saved game?
If the answer to these questions is "yes" then the game you reloaded in Driver was a copy of the layout as it existed when you last saved it in Driver - before you made the layout alteration.
To play with the new "improved" layout with the extra house you must load it into Driver as a new game.
OK - but this is the penalty you have to pay.
Suppose instead of just adding a house or altering a few items of scenery you changed the track layout. If you deleted or moved a section of track that was occupied by one of your trains at the instant you had previously saved the game in Driver, then what would happen to that train when you reloaded the game?
This forum used to contain many a sad story from people who had deleted a section of track in a layout only to discover that the very same section of track (now gone) was occupied by a train in one of their Surveyor created sessions - the train (if it was a steam train) turned in a "Cheshire Cat" (of Alice In Wonderland fame) and would be visible only by its smoke.
Not a satisfactory answer, I know - but this is one of the limitations of the program.
Peter Ware