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Bad internet connection maybe?
It's definitely on the DLS and not a brand new upload, so CM should be able to get it.
Trainz-build 3.4 assets require either TS2010 with the multiplayer beta patches installed , or TS12 (or the Mac equivalent).
Shane
This list might help you understand / recognize what is and what is not possible:
http://online.ts2009.com/mediaWiki/index.php/"Trainz-build"_tag
I'm not personally aware of any issues with said patch apart from the fact that there is no compatibility mode once the patch is installed (only native mode, which means that assets that require compatibility mode will not function or look correct).
As for your other question, it may be related to how the asset is downloaded and installed, as if it's downloaded outside of Content Manager and installed from a .cdp file, then it behaves differently to if the download is attempted within Content Manager.
Shane
........ CM blocks the download of a higher build number, but has never stopped you seeing the asset....