Kann dieses Tutorial (PDF) bestens empfehlen. Ist in Englisch, aber sehr gut illustriert. Habe lange nach sowas gesucht. 
Link dazu: http://railworksamerica.com/in…ors_guide_tutorial_rudolf
Rudolf Heijink (rudolfJan) published this series of three tutorials destined to aspiring scenario authors.
Part I is an extenvive beginners guide, that leads you step by step through the process of creating simple scenarios. It comes with sample scenarios, an extensive table of contents, 50 illustrations, index and glossary. 73 Seiten
Part II covers advanced topics regarding scenario creation. 73 Seiten
Part III covers creating LUA scripts. 103 Seiten
For your convenience, all files have been packaged together in a zip file available from the RWA file library.
Download Rudolf's scenario autor's guide.