I don't know much about updating assets, but you CAN NOT remove your own old assets, nor anyone else's assets from the DLS ... as when you uploaded them to the DLS, you signed a electronic virtual agreement, and your assets became property of N3V ... I understand that you can update your original assets with a new Kuid numeral, or something like that ... which almost over rides your original asset.
People are always updating a lower 1.3, 1.5, 2.4, 2.6 trainz-build asset, and making it a 09, 10, 12 trainz-build numeral ... which disables the asset in a really low trainz-build like 04, 06 ... and this is totally rude and wrong to alter OPS (OtherPeoplesStuff) and is tiresome to have to continually / repeatedly keep backdating updated assets ... just because someone wants to run a 1.3 asset in TS12 multiplayer ... they take it upon themselves to alter the original asset, and they take the original asset away from 04, 06, 09, 10 users.
If you really want to make something ... Go make it yourself ... from scratch ... and do not use, abuse, or alter, OPS (other peoples stuff).
I would really absolutely love it if someone would take my (cascaderailroad) TRS2006 Paintshed TGV's, and make them use animated bogies
