I'd bet it was budget cuts. There's a reason why Ride of Steel only has 1 train.
Bizarro at SFNE still has mist effects...
I bet it was a budget cut too. Also Ride of Steel has two trains, every coaster at the park does. From what I heard, every coaster only ran one train this year due a dispute between managements. Maybe someone knows more or could help explain it better.
Not every coaster at Darien Lake runs two trains, Boomerang and the kiddie coaster always ran one train. I wouldn't think the reason that the coasters at Darien Lake the have more than one train are on single train operation is that of a dispute with Herschend and CNL. I would think that the second trains are just going under refurbishment.