8
part is beamed away. I know it would have been more useful for us to beam the
part back onto your workbench but someone’s been fiddling with our transporters
and we haven’t been able to fix them. Sorry.
• To that end, please make every effort to ensure nothing flies away. Work on a
clean, white surface. In fact, paint all the walls, the floor and the ceiling white,
wear white coveralls, and remove everything else from within a three-mile radius
of your workbench, especially (but not limited to) vegetation, people and wind.
• Turn the locomotive upside down in a foam cradle (painted white, of course) and
remove the coupler screws. Pull the coupler boxes out of the ends and turn the
loco right-way up. Now wiggle the shell off. Carefully. Remember the transporter
lock.
• That’s it, really.
• No, really.
OPERaTION – DC (SILENT)
If your GMD-1 locomotive is not equipped with a sound decoder, it should function like
most other HO scale locomotives. The gear ratio is 14:1 so there is a good chance that
it will MU (multiple unit) with your existing fleet. Put it on the track. Give it some juice.
Watch it go.
But please note that we can’t guarantee that your GMD-1 will actually MU with locomo-
tives from other manufacturers. There are just too many variables involved - things like
how much or how little drag the gearbox has, the speed of the motor itself or the current
draw of the lighting. All of these affect how a unit runs and what its start voltage will be.
The gear ratio is only one factor, albeit a big one.
(Of course, you can easily ensure that all of your locomotives from all manufacturers MU
smoothly together by upgrading your layout to DCC. Jason likes to say that DC is a great
system, but so was Betamax...)
In DC, the number boards are always on and the headlights are directional. The class
lights are installed and wired, but they will not work in DC.
INSTaLLING a DECODER
The GMD-1 contains an ESU-designed motherboard which is connected to the track,
motor and lighting outputs. A blind plug is attached to the motherboard using a 21-pin
connector. To install a decoder, remove the blind plug and install a 21-pin decoder
(recommended) or a 21-pin adapter to attach an 8-pin or a 9-pin decoder. Your chosen
decoder should have six function outputs.
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