The Rocky River “Dummy” Railroad provided a portion of the original route for the Nickel Plate. At least one source says that a “Dummy” Railroad was so called because the steam engine was concealed in a streetcar-type body so that the engine would induce less fear in horses. In these early years streetcars were still pulled by horses so horses were familiar with them.
Other sources say “Dummy” meant the engines were smaller, produced less steam and smoke, and were extremely quiet relative to other types of locomotives. The Rocky River railroad was a narrow-gauge line with a small engine, so this could be possible.
A third theory is that “Dummy” referred to the fact that the engines were not smart enough to turn around (because they had no turn table) so they had to back up for a return trip. This last reason may be the most plausible for the Rocky River line because early maps do not show any way for the train to turn around at either end of the single-track route.