This installation is for a HO-Scale Atlas GP40 using a TCS WOW121-Diesel Decoder and AS-MB2 NC.

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-KAT-3 which was used for this installation.
AS-MB2-NC Motherboard WOW121-Diesel Decoder UNIV-SH1-C Speaker Kit KA4 Keep-Alive™
Click here for more information on the WDK-KAT-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


HO Scale Atlas GP40 prior to installation.
To start off this install, we must first remove the front and rear couplers and their housings. Once that is complete, the shell will lift off of the chassis.

With the shell off, we can now remove the factory light board. First remove any wire clips and disconnect the wires from the board.
Once the wires are loose, the factory light board can easily be unclipped from the motor mount.

Next, we can attach leads to our front 3mm LED and solder the other ends to our AK-MB1

For the installers conveinence, all lighting funtions feature on board current limiting resistors.

Once complete, we can remount the front weight and secure the LED down in the lighting channel.

Make sure to insulate the LED leads from each other as well as the weight.

In our install, we used a 3mm Sunny White LED (Item 1288).



Next, we can attach a SMD LED to the rear light. In our install, we used a Sunny White LED (Item 1417) and glued it to the rear light optic with some CA glue.

Once attached, we can now mount our speaker housing kit.

In order to keep it from rattling and moving around, some double sided tape or CA glue secured it to the ceiling of the locomotives shell.

After attaching the SMD LED to the optic and mounting our UNIV-SH1-C, we can now solder our rear light and speaker leads to the pads on the AK-MB1.


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 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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