This installation is for a HO-Scale Dash 8-40CW using a TCS WOW121-Diesel Decoder, AK-MB2 Motherboard, KA4 Keep Alive™
and 32mm 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-4 which was used for this installation.
AS-MB2 Motherboard WOW121-Diesel Decoder KA4 Keep-Alive™ 32mm WOWSpeaker
Click here for more information on the WDK-ATL-4 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

HO-Scale Dash 8-40CW shown prior to installation.


    To start off this install, we must first remove the front and rear coupler screws highlighted above and their housings.

With the couplers removed, while gently pulling outwards at each end and along each side of the frame, lift the shell off of the frame.
Take care to release the handrails as you lift off the shell so they don't break.

The Dash 8-40CW shown with the shell off. Unplug the wires from the original lighting board and remove it from the chassis along with the dummy speaker plug.

Shown with the original lighting board removed. Take note of the wire functions.

Attach the AK-MB2 to the frame and plug in the motor and track pickup wires according to the included wiring diagram.

Using double sided foam tape, mount the KA4 as shown to the frame and solder the leads to the AK-MB2
according to the included wiring diagram.


Insert the speaker plug into the left side frame opening and secure it with the metal clip, then likewise insert the 32mm WOWSpeaker into the
opposite opening, secure it and solder the leads to the AK-MB2. The above right photo is showing the locomotive in reverse orientaion for this purpose.

It is important to use this plug as it greatly increases the volume and 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 Dash 8-40CW 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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