This installation is for a HO Scale Bachmann Niagara 4-8-4.

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 WSK-BAC-1 which was used for this installation.
B-MB1 Motherboard with Keep Alive™ WOW121-Steam Decoder UNIV-SH1-C Speaker Kit
Click here for more information on the WDK-BAC-1 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 Bachmann Niagara 4-8-4 shown prior to installation.

    To start off this install, we must first disconnect the tender from the locomotive. Then remove the single screw highlighted above in red along with releasing
the grab hand rails at the bottom as highlighted. With this complete, gently pull outwards at the end to remove the end of the tender.

With the front end removed, carefully remove the rear end of the tender. It is simply pressure fit in place. With it removed, pull the LED at the rear of the shell loose.
Next, loosen the two screws highlighted above in red. You do not want to remove them entirely, but by backing them out, you provide clearance to slide out the
lighting board platform inside.

With these steps complete, you can simply slide the original lighting board platform out of the shell. You will notice on the inside of the shell, two rails
that hold the platform down in place. Remove the track pick up wires only from the original lighting board and remove it from the chassis.

Remove the two screws highlighted above in red and remove the lighting board from the platform. Save one screw for reuse.

Using hot melt glue, secure the 28mm WOWSound speaker into the frame as shown above, then using the saved screw, mount the B-MB1 to the platform.
Insert the LED back into the shell and feed the wires through the shell. You might need to extend these leads in length.
Solder the track, motor, LED lighting and speaker wire leads to it according to the included wiring diagram.
Using small lengths of TCS 3/32" and 3/64" shrink tubing, insulate these solder leads as needed.
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.

TCS motherboards include on board current limit resistors for LED use. There is no need to apply external resistors for LED use. 

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

With the installation complete, gently tuck the internal platform into the tender shell and being careful to fit it under the internal shell rails,
slide it into the shell. It should go in fairly easily.


With the platform securely inside the tender shell, tuck the wire in carefully and close up each end. Remember to retighten the track pick up screws on the bottom
Your Bachmann Niagara 4-8-4 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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