I just attempted "GR5-03 -- Coaljob", a scenario created by German Railworks for the Hagen to Siegen route. After driving for a while, the player has to pull into a siding to allow an Intercity passenger train to pass. About 10 seconds after the signal ahead turns green, the scenario comes to a (literally) crashing halt due to an AI collision. I didn't react quickly enough to capture a screenshot of the error message.
If memory serves, this is a payware scenario that I originally purchased for RS.