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I agree with you that there does seem to be some good content on the DLS that needs SP1.
On the other hand they could be setting the trainz-build to match the version in which the fix was tested which is common sense.Most of which works perfectly fine in TS2010 and even TS2009; it's just that, in the vast majority of cases, creators or DLS Cleanup fixers unnecessarily set the Trainz-build to 3.7 because they don't have a clue what they're doing, although I know of one that is deliberately trying to break compatibility with older versions.
On the other hand they could be setting the trainz-build to match the version in which the fix was tested which is common sense.
Paul