7
MTH GP38-2 Operating Instructions
speeds. Reduce the voltage
setting on your transformer if
this occurs and run your engine
at a slower speed before firing
the coupler. If the coupler
continues to open erratically,
try lubricating the knuckle with
light oil as indicated in Fig. 2.
For multiple heading purposes,
only one of the two ProtoCouplers™ will function at any one time. Use the
coupler direction switch as shown in Figure 3 on page 17 to select either the
front or rear coupler. Simply slide the switch toward the direction of the
coupler you want to make active.
DIESEL CAB CHATTER SOUNDS
Whenever your diesel locomotive is parked in Neutral, randomly played
“Cab Chatter” sound effects will occur every 2 to 30 seconds. There are a
total of four of these Cab Chatter sequences that capture authentic radio
transmissions between dispatcher and engineer. They are designed to play
at random intervals to eliminate repetitive and boring sequences though
there is no guarantee that you won’t hear the same message repeated two or
more times.
SQUEAKING BRAKE SOUNDS
Proto-Sound® equipped engines feature the ability to play the sound of
squeaking brakes whenever your engine slows in speed. There are two
settings for activating the squeaking brake sounds. The default setting
allows the brake sounds to play while the engine is in forward or reverse
and the transformer throttle is lowered from a high setting to a low setting
(14 volts to 8 volts or less). The sound itself is a stored recording on the
Proto-Sound® software chip and will always play the same brake sound for
the same three second length each time the voltage is reduced from high to
low. Some practice may be
required to synchronize the
playing of the brake sounds
with the movement of the
engine. It is not uncommon for
the engine to stop before the
Lubricate
Proto-Coupler®
Knuckle
Figure 2: Lubricating The ProtoCouplers
Throttle Down From
High Voltage To Low
Listen For The
Squeaking Brake Sounds
