This installation is for a HO-Scale Atlas DASH 8-40B using a TCS WOW121-Diesel Decoder, AS-MB2 Motherboard with built in Keep Alive™, and ? WOWSpeaker kit.

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
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-2 which was used for this installation.
AK-MB1 Motherboard with Keep Alive™ WOW121-Diesel Decoder UNIV-SH4-C Speaker Kit
Click here for more information on the WDK-ATL-2 and the rest of the WOWDiesel Kits line.

HO-Scale Atlas DASH 8-40B prior to WOW121-Diesel Decoder, AS-MB2, and ? 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 and the rear "Analog"/"DCC" selector board can be unscrewed and removed.

Now with the factory light board removed, we can now clip in the AK-MB1.

Next, solder the motor and track pickup wires to the AK-MB1 according to the wiring diagram in your motherboard manual.

This engine came supplied with 12volt bulbs, they must be replaced with LED's because the AK-MB1 is configured for LED use only. However for convenience the AK-MB1 has built in current limit resistors in series with the light outputs for LED use so no additional resistors are needed. We used our own TCS Sunny White LED's SKU number: 1288.

With the AK-MB1 mounted, we can now solder some wire leads to our speaker and place our speaker inside the UNIV-SH4-C speaker housing.

With our speaker mounting in the housing we glued the complete package up into the shell as seen below.

NOTE: You must be very careful to avoid getting glue on the speaker cone. Glue on the speaker will ultimately cause it to produce no sound and fail.

Lastly, solder your speaker wires to the AK-MB1 and plug in your WOW121-Diesel decoder.

With all three main components mounted, we can now 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.

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

Like us on Facebook Subscribe to our YouTube Channel Join our newsletter
  Back To Top
Entire contents © Copyright Train Control Systems 2004-2018