Good enough for a backstory? Turn on the lights, I say.
In regards to the interlocking loops, based on the location of the loops, I think the only way to have the trains looping simultaneously would be to have 3 trains running. I think it's been quite a long time when they could justify using that many trains on Nessie. Usually when there's only 2 trains running on any roller coaster, train 2 doesn't dispatch until train 1 has hit the block brakes at the end of the ride or extremely close to. Running only 2 trains, it would be extremely rare for the second train to even be on the lift hill while another train is in the final loop. While I would love to have trains looping simultaneously, Nessie's ridership just doesn't justify it.
I have never ridden Loch Ness with the lights on and wonder what it would be like? The tunnel is already good on it's own. Hope the petiton works..