Trapped Guests and the Train from Hell- 2 of 2 Planet Zoo follies

So I got this brilliant idea to put the entrance at the top of a mountain - attached to a massive Arboretum full of Bonobo Chimps, Mountain Gorilla and Gibbons.
And I forgot to turn off the spawn decks down on the original entrance. I've been building on this zoo off and on - more off than on- for weeks. Every once in a while, especially when finally working on the habitats down the hill, I would faintly hear something like panicked yelling and screaming. I was thinking it was people on the train when I have the speed turned up. But NO- to my horror I discovered some guests came in on the old spawn decks and got STUCK. It's been FIFTEEN years.
I have tried deleting old path, adding new path. Putting drink shops on the path beside them to get them to move. Getting security to kick them out. Cntrl z'ing them. Putting spawn decks on the new path directly under them. I tried JHolthausen and SelenaM. SelenaM works because now they are screaming and panicking but with balloons. So it's more cheerful now.
Anyway, I decided to turn lemons into lemonade and make a walkthrough exhibit out of them for other guests. I had to make a 10 mile path down the mountain and around the train and the only way it could go is over the Pit of Despair, which is a deep, long escape tunnel with a big open trench at the top I dug for my Lions if they should ever decide the captive life isn't for them. But then I wondered if a tightly packed cluster of hysterical people with balloons was maybe a little boring, so I added a pack of African Wild Dogs and a French Fry truck.