Southern Pacific 745, a 2-8-2 was once on display in Audubon Park. It was restored some years ago but has not been out for a while...I remember some sort of significant (?) issue occuring with the locomotive and has not operated for a few years...that will need a verification however! It is owned by the Louisiana Steam Train Association.
I do know that Audubon Park does operate a Chance CP Huntington, similar to what we run on our scenic excursion trip (we do NOT run it as an "amusement ride") through a local 500+ acre regional stream valley park. Our locomotive is a 1995 model, which replaced our original mid-1960s locomotive and our 5 passenger cars are the originals from 1966. Audubon's engine, #273, is only a few years older than our #281. Chance numbers their locomotives as the build number. For example, our #281 is the 281st CP Huntington built while the neighbors somewhat new 2008 model, #357, is the 357th built.
Below is a photo of our #281, taken last fall by yours truly on the return trip from an inspection trip/deadhead/test run movement. This curve is the only spot on the line in which the tree canopy lets in some decent sunlight!