This installation is for a HO-Scale Rivarossi 4-6-4 using a TCS WOW121 Steam Decoder, B-MB2 with Keep Alive®
and 32mm WOWSpeaker.

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:

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

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.


HO-Scale Rivarossi 4-6-4 shown prior to installation.

To begin, remove the screw highlighted above in red located in the front of the locomotive.


    Next, we must first remove the right and left side screws highlighted above.

With these screws removed, while gently pulling outwards at each end and along each side of the frame, slide the shell backwards and 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 Rivarossi 4-6-4 shown with the shell off. Remove the two clips in front of and behind the motor as highlighted above in red and remove the motor from the chassis.

Shown with the motor removed. Take care that the drive components stay in place for reinstallation. Unsolder the wire leads connected to the motor and frame.

Solder in the new wiring harness according to the included wiring diagram.

Before reinstallation the motor, cover all the contacts with Kapton tape to be sure they are well insulated from the motor.

Show with the motor reinstalled properly.

Splice the front lighting lead into the harness as shown above.

Using a sharp x-acto blade, trim a rectangular opening for the connector installation in the rear of the locomotive. Using hot melt glue, carefully,
mount this in place securely flush with the rear plate of the locomotive.


With the locomotive finished, next is to install the WOWSound kit into the tender. Start by unscrewing and removing the small pin in the front of the tender,
setting aside the in, washer and small nut for reinstallation.

Remove the screw highlighted above in red from the other end of the tender. Lift the tender shell off of the frame.

The tender shown with the shell off.

Wrap the capacitors located on the bottom of the decoder to insulate them and prevent possible shorts against the weight.

Using double sided foam tape, mount the B-MB2 to the weight.

Solder the connector leads from the locomotive to the B-MB2. We chose to put a connector on the rear LED lead to ease shell removal later if needed.

Using a small dab of hot melt glue, mount the tender LED against the rear light tube.

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

To ensure the very best sound quality and volume, drill a series of small holes in the bottom of the tender floor to allow the sound to escape the shell.|
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 tender. Be sure to be mindful of wire routing and reassembly of the shell as to not damage 
or foul the installation. Your Rivarossi 4-6-4 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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