Gwazi has at least 4 trains. It has 2 trains per side. That means 2 Gwazi Lion trains, and 2 Gwazi Tiger trains. Gwazi is a duelling woodie, so it will always be running at least 2 trains at a time, 1 lion train, and 1 tiger train, but most likely it will be running all 4 trains. And when you get to the park, (Get there EARLY, or you may not get in at all!) you'll know why. It takes at least 2 days to see all of the animals and exhibits, and usually over an hour of waiting for anything that you want to ride, so be prepared for HUGE crowds, unless you go on a weekday during the off season. And yes, this park WILL refuse to let you in after around noon or so, because of the large amount of people already in the park, so get there as early as possible, or don't be surprised if they turn you away!
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http://www.angelfire.com/tx2/GayRollerRide/