Many veteran creators host content on private websites rather than the official DLS. If the Content Manager fails, use these community-trusted search tools:

to indicate updates; higher numbers automatically override older ones in the game. 2. Searching within Trainz Content Manager The built-in Content Manager (CM)

If you know the creator's UserNumber, filter your search by "Author" to see if the asset is packed inside a larger dependency pack. Step 2: Leverage Dedicated KUID Search Engines

: Some missing KUIDs are part of built-in routes or paid DLC [17]. If a KUID starts with a specific range, it may be "built-in" content you haven't installed yet [19].

Indicates the revision history. A :2 means it is the second update of that specific asset. Trainz automatically prioritizes higher version numbers. Step 1: Finding Missing KUIDs in Content Manager

Check the "Missing Dependencies" thread on the official Trainz forums.