This site belongs to John Whelan who made be contacted via the Trainz forum private messages.
It does not use any scripting. In the downloads area you'll find both my and some other content creators Trainz assets for various versions of Trainz though TS12 is recommended.
www.trainz-carriage-wagon-works.com contains screenshots of many of the assets available here
We are listed on www.trainzkuidindex.com which is a database of kuids for Trainz.