American Flyer Set #1200 from 1918
Catalog illustration
The catalog cut is interesting for a number of reasons. First is the illustration of the set itself. The cars are listed as being #1104 baggage and #1103 Passenger cars and the set is shown as powered with dry cells and a rheostat. The prospective owner is encouraged to think about upgrading to a transformer. The boxed text on the left hand side says "Trains can be run on 3 or 4 dry cells. Or they can be run by connecting up a transformer to your electric light socket if you have 110 volt alternating current."
The illustration of the transformer in the lower left is interesting today because of the way the term "electric light socket" has evolved over time. Today one would think in terms of a plug outlet but back in 1918 they did indeed mean an electric light socket - note the screw in fitting for an actual electric light socket at the end of the transformer cord.
The box cover, of course, takes liberties with the actual contents but it certainly appeals to the imagination of what your toy railroad empire might aspire to.
Box Cover
...and finally there is the actual contents. As you can see this set has a #1200 baggage and a #1201 passenger car instead of the cataloged 1104 and 1103 cars.