This installation is for a HO Scale Atlas GP39-2 Ph2 using WOW121 Diesel Decoder, AK-MB1 with Keep Alive™
and UNIV-SH1-C WOWSpeaker kit by TCS.

This was performed by our friends from DCC Xpress installations.
They offer high quality WOWSound installations for a flat rate complete with free return shipping!
You can find them at:

These items are available in the WDK-ATL-3 which was used for this installation.
AK-MB1 Motherboard with Keep Alive™ WOW121-Diesel Decoder UNIV-SH1-C Speaker Kit
Click here for more information on the WDK-ATL-3 and the rest of the WOWDiesel Kits line.

Important Soldering Tip:
Please do not use any flux either liquid or paste on the mother board. It will damage it. Use only Rosin core solder approved for electronics use.
We recommend to use only Kester "44" rosin core, SN63PB37, .015" diameter, part number 24-6337-0007.
This can be ordered from Techni-Tool under Techni-Tool part number 488SO157

Atlas GP39-2 Ph2 prior to installation.


Begin this installation by removing the screws on each coupler and removing the coupler boxes. Grasp the sides and each end of the shell and gentle pull
out to release and lift it from the frame.

The Atlas GP39-2 Ph2 with its shell removed. Remove the wires and remove the board from the frame, taking note of the wiring layout for reinstallation.

With the original lighting board removed, trim, tin or lengthen the wires as necessary.

Attach the new AK-MB1 motherboard.

Solder the motor and track leads to the motherboard according to the included wiring diagram. We secured these leads using Kapton tape to
eliminate movement and prevent potential shorts. We reused the original LED's in this installation. If you do not remove the resistors in series
your lights will not activate. TCS motherboards all include on board current limit resistors for LED use. There is no need to apply external
resistors for LED use.

With the 35mm x 16mm speaker inserted into the UNIV-SH1-C enclosure, using double sided foam tape, securely mount this assembly into the top
of the shell as shown.

If your speaker enclosure installation covers the portholes on the enclosure, we recommend adding new port hole(s) similar to the original porting. Be sure that the new portholes are the same size and amount of the original and are vented freely into the locomotive We have found introducing a port of the correct size greatly increases the volume and sound quality of the installation. Too much or too little porting decreases the sound quality.

You can now plug in your WOW121 decoder.
Lastly, in order to keep the wires neat and prevent possible shorts, lace the wires into a bundle using lacing cord, which is a wax impregnated string 
used for wire bundling and making harnesses. There are many choices of lacing cord available from Digikey
We use part number 802534B BK032-ND

Now you can close up the locomotive and reinstall the coupler assemblies. Be sure to be mindful of wire routing and reassembly of the shell as to not damage 
or foul the installation. Your Atlas GP39-2 Ph2 is now WOWSound equipped and ready to roll!

Other solder tips: When stripping wire, only strip a tiny little bit of the insulation. Strip no more then a 1/64 of an inch. When the wire gets tinned with solder the insulation will shrink back more. Try to not expose any more wire then half the length of the solder pad at most. In no case should solder or exposed wire wire ever be outside the boundary of the the solder pad you are attaching a wire to.
Click here for important information on properly Stripping and Tinning wire

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