While in transit, mail was canceled on these trains using rubber stamps denoting the railroad. In 1961, the Washington Park and Zoo Railway became one of the first recreation railroads to have it's own cancellation stamp. With the demise of the Railway Post Office, the Zoo Railway is the last operating United States railroad with its own authorized Railway Postal Cancellation, to continuously offer mail service. Mail deposited in mail boxes on the Zoo grounds or on the locomotives is hand-canceled with the Washington Park and Zoo Railway stamp. It has become quite a collector's item.
Mail comes in from and goes out to all parts of the globe.
Take a train ride through a winter wonderland. During December, the zoo is transformed with a half-million lights and more than 200 sparkling animals.