The last car of the train has a spot on the end for a wheelchair/ECV where my DD rode. It looked to me like there were 5-6 wheelchair spots on the whole train.
There is a fairly long path from the train to the building that houses the exhibits. The path is fairly wide, mostly level and there are stops along the way with roofed or umbrella'd areas with benches for resting, Some have exhibits where CMs talk about animals or ecology.
There are wheelchair/ECV spots on the ends of several cars of the train. It appeared to me that there were 5-6 spots.
You need to back the wheelchair/ECV in, but it is very level and the space is fairly wide