This photograph was taken in early September of 1987 at the Milwaukee county zoo in Wisconsin.
The zoo railroad operates on 15 inch guage track. The gasoline powered locomotive appears to be a reasonable facsimile of an EMD GP-7 Diesel locomotive.
Interesting facts and simularities:
Chicago Illinois has 2 zooalogical parks.
#1. The lincoln park zoo in metropolitan Chicago.
#2. The Brookfield zoo wich is located in west
suburban "Brookfield Illinois.
Milwaukee Wisconsin has only one main zoo wich is the Milwaukee county zoo. The Milwaukee County zoo is also located in one of the citties western suburbs, wich just happens to be "Brookfield Wisconsin". Chicago's Brookfield zoo had a Zoo Train from 1967 to 1985. Milwaukee still has a zoo train, and it is very alive and well.