Scenario Scripts

Hello Group,
I tried the search function without any success
Is there any in depth documentation on how to write and / or edit Scenario Scripts? At first glance they appear to be the same LUA scripts used for locomotives and rolling stock. What I'm looking for is a list of available functions, verbs, symbols, etc... It appears in the new scenario scripts for the Horseshoe curve route you can do a number of things that were not possible with RW2
Regards,
Rich S.
I tried the search function without any success


Regards,
Rich S.