411 REFERENCE · Wikibooks
Trainz/API and Scripting Guide
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Trainzdev and the Trainzdev wiki has much more current information for later versions.
TRS2006 Scripting and API guide http://web.archive.org/web/20060310072511/http://files.auran.com/TRS2006/manuals/TRS2006-API.zip
TRS2004 Scripting and API guide (Local drive)/Auran/TRS2004/Scripts/docs/index.cfm
Also see the scripting section in the level above.