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Does the Trainz version have an influence on the Transdem generated map ( created in 2012 )?
Yes. TransDEM exports adjust to subtle and and more prominent changes in the Trainz route file formats up to T:ANE SP1. The most obvious was lighting which lost backward compatibility with T:ANE.
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If not, would it be possible to change the elevation height of my entire route ( now within TRS19)?
No, not possible I'm afraid. That's because of the new per-baseboard route file formats, starting with T:ANE SP2, which I never managed to fully analyse.