That was what was supposed to have been built along with the ride excavator, which would've featured some interns taking a work train for a joyride. Then the Dinosaurs on the worksite would've come alive. Think BTMTRR with a chase involved.
You can still find references to the orignal theme all over DinoLand if you're looking.
All this was never built, and as bad as that was, it was understandable. Plans change, and the resources weren't available. However, they committed the greater of the design sins. They built crap instead. They didn't design a middle ground, instead they took the easy way out. That to me is unacceptable. Even worse if the fact it hasn't been replaced yet. Still a decade+ latter it exists.