This installation is for a HO Scale Atlas Silver GP40-2 Phase 2 using a TCS WOW121 Decoder, AS-MB2 motherboard, KA4 Keep-Alive™,
30mm WOWSpeaker kit by TCS.

Kit Coming Soon! We are in the process of assembling all the items shown here into a new WOWKit.
Please check back here to see the new WOWKit when it arrives.


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-5 which was used for this installation.
AS-MB2 Motherboard WOW121-Diesel Decoder KA4 Keep-Alive™ 30mm WOWSpeaker
Click here for more information on the WDK-ATL-5 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

The picture above shows the beautiful Atlas Silver GP40-2 Phase 2 with its shell on prior to installation.


To begin this installation, you must first remove the front and rear coupler box screws as indicated above and then the coupler boxes.
With them removed, grasp the shell on either side and pull outward gently while lifting up.

The Atlas GP40-2 Phase 2 shown with the shell off. Unplug the JST connectors, remove the original lighting board and the speaker plug.

Utilizing the original JST connectors, attach the AS-MB-2 motherboard and plug the connectors in the appropriate spaces.

Mount the KA4 to the rear of the front light post with double sided foam tape or hot glue and solder the leads to the AS-MB2 according to the
included wiring diagram.

Install the 30mm speaker into the right side of frame opening as shown facing in and solder the wire leads to the motherboard.
The right side mount was chosen as this is a very tight installation and a left mounted speaker prevents the bottom frame member from properly
aligning with the shell. With the speaker in this orientation, the shell installs tightly.

It is important to use this plug as it greatly increases the volume and sound quality.
Insert this plug into the port opposite the speaker.
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 GP40-2 Phase 2 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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