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Proto-Coupler Operation
This locomotive is equipped with one or more coil-wound Proto-Couplers for remote
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uncoupling action. Because Proto-Couplers are controlled through the Proto-Sound
3.0 microprocessor, they do not require an uncoupling track section or modification to
your layout to function. You can fire a coupler from neutral or while in motion. Use the
code shown below (and in the chart on p. 25) to fire the coupler(s).
Rear Coupler
To fire the rear coupler, quickly tap the Bell button once followed by three quick taps of
the Horn button, allowing approximately ½ second to lapse between each quick button
press. The sound of the liftbar and air line depletion will play, and the knuckle will be
released.
Front Coupler
To fire the front coupler (if your engine has one), quickly tap the Bell button once
followed by four quick taps of the Horn button, allowing approximately ½ second to
lapse between each quick button press. The sound of the liftbar and air line depletion
will play, and the knuckle will be released.
Horn
Horn
Fire
Rear
Coupler
=
Horn
Bell
Horn
Horn
Fire
Front
Coupler
=
Horn
Horn
Bell
Premier SD50 Diesel Engine
11
Tips on Using PFA
• You can terminate PFA at any time by turning off power to the track for 15
seconds.
• You do not have to be in Forward to use PFA. At the conclusion of the full
sequence, the train will pull away from the station or yard in whatever direction you
were going when you activated the feature.
• You can use PFA even if you are double-heading with another engine. If the
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second engine is not equipped with Proto-Sound 3.0, you must remember not to
leave the throttle at a high voltage level once you have stopped the engine to run the
PFA. Otherwise, the engine without PFA will begin vibrating on the track as its
motors strain to move the train, since they cannot be automatically disabled during
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the PFA cycle (or if an original Proto-Sound engine, PFA are triggered differently
and that engine's motor-disable feature will not be active when you run PFA in
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Proto-Sound 3.0).
• PFA can be triggered from Neutral. It will operate the same as if triggered while
in motion except that, at the conclusion of the PFA, the engine will depart in the
next direction of travel, as opposed to the direction it was traveling before entering
Neutral.