12
R-17 Subway Set with Proto-Sound® 2.0
Speed Control
M.T.H. engines equipped with Proto-Sound 2.0 have speed control capabilities that allow
the engine to maintain a constant speed up and down grades and around curves, much like
an automobile cruise control. You can add or drop cars on the run, and the engine will
maintain the speed you set.
While the engine is programmed to start with the speed control feature activated, you can
opt to turn it off. This means the engine's speed will fall as it labors up a hill and increase
as it travels downward. It is also affected by the addition or releasing of cars while on the
run. Because the engine will run more slowly at a given throttle voltage when speed control
is on than when it is off, you should adjust the throttle to a lower power level for operation
with speed control off to avoid high-speed derailments. When speed control is off, the
volume will drop to allow for better low voltage operation.
To turn speed control on and off
, put the engine in neutral, then quickly tap the
transformer's Horn button one time then quickly tap the Bell button two times, allowing
approximately ½ second to lapse between each quick button press. Two horn blasts will
indicate that the engine has made the change. Repeat the 1 horn, 2 bells code to return it to
the other condition. You will want to do this during the initial neutral upon start-up if you
ever couple this engine to another engine that is not equipped with speed control to avoid
Horn
Place
Engine into
Neutral
Bell
Bell
=
Speed Control
Two Horn Blasts
(indicates change is made)
Repeat to Return
to Normal Condition
