Basically, the Wildlife Express Train is simple transportation. From its starting point in the Africa section of Animal Kingdom, it brings guests to Rafiki's Planet Watch and then returns them back to Africa again. Once you board the train, your sitting areas face outward from the train rather than forward, so anything you can see you see on one side of the train, the side you're facing. Mostly you see road, plants, and some behind-the-scenes animal care buildings. On occasion, the pens in these buildings will have a resting rhino, elephant, or other animal that can be quickly observed before the train pulls away.
There's not a whole lot to say about this ride, because all it really is for is to get you from point A to point B and then back again.