TCS - Train Control Systems

TCS 1752 WOW Kit WDK-ATL-4 with WOW121-Diesel DCC Sound Decoder For Atlas Models

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TCS 1752 WOW Kit WDK-ATL-4 with WOW121-Diesel DCC Sound Decoder For Atlas Models

Each WOWKit has been engineered for a perfect fit in your locomotive. Even if you are new to DCC or DCC installations, you can achieve Easy, Clean, Professional results using WOWKits. WOWKits make sound installation as simple and all-inclusive as possible. A list of compatible locomotives for this WOWKit can be found in the "Compatibility" tab.

The TCS website features step-by-step installation pictures and instructions for each WOWKit. Visit the installation pages and search by locomotive.

This kit fits the following locomotives:


  • Train Master H-24-66
  • Train Master 1B
  • Dash 8-40C

More locomotives being added to this list as they are confirmed. 

Included in this WOWKit:

  • 1x WOW121-Diesel Decoder
  • 1x AS-MB2 WOWMotherboard
  • 1x KA4 Keep-Alive
  • 1x 30mm WOWSpeaker (with speaker wires)

WOWKits provide everything needed for a complete sound installation.


TCS WOWSound DCC Sound Decoder - WOW121-Diesel

The WOW121 is a universal sound decoder for locomotives with DCC-ready 21-pin MTC connectors, and can also be used with any of TCS' motherboards. The WOW121 requires a motherboard to interface with the locomotive. The motherboard will determine the support for the number of lighting functions as well as the type supported (LED or 12V/1.5V bulbs). A WOW121 decoder will support up to 8 lighting functions.

Note: Function 5 and 6 are not programmable, and will only output constant bright lights. Take this into account when wiring multiple lighting functions.

For a complete list of available sounds, check out the "Sounds List" under the "Documents" tab.

  • CD-Quality Sound: TCS' world-renowned CD-quality sound. 16 Bits of resolution at 44.1kHz sample rate.
  • Back EMF Load Compensation: Provides superior slow speed control and high performance under load.
  • Quiet Drive: Super-quiet motor control for "buzz" free motor performance.
  • Variable Momentum: Allows you to make custom acceleration and deceleration curves.
  • Incandescent Bulb Support: This decoder can be used with 12 Volt bulbs.
  • Function Remapping: Buttons 0 through 12 may be used to control the lighting functions of this decoder.
  • Programmable Lighting Effects: Choose from 20 separate user-programmable lighting effects!
  • Dimmable Brightness: Configure multiple different brightness levels for your LED's or incandescent bulbs.
  • Decoder Lock: Feature which prevents accidental/unwanted programming while activated.
  • Airwire™ Compatible: Fully compatible with Airwire™ operation.
  • Audio Assist®: TCS exclusive auditory feedback programming system. Program your decoder without the need tomemorize CV's!
  • User-Loadable Speed Tables: Configure custom speed curves and set speed limits.
  • Throttle Modes: Choose from multiple throttle modes to meet your operating needs.
  • Proto Notch™: A WOWSound original feature which uses TCS’ exclusive auto-adjusting BEMF technology to automatically choose the active notch sound. Prototype Mode also offers dynamic sound volumes which accurately model the real-life equivalent. Also includes pre-programmed acceleration and deceleration values.
  • Interface Type: Hard-Wire Direct-Plug (9-Pin JST)
  • Dimensions (L x W x H): 1.35" x 0.658" x 0.22" or 34.29mm x 16.72mm x 5.59mm
  • Scale: HO Scale
  • Continuous/Peak: 1.3/2.0 Amp
  • Total Functions: 6
  • Function Rating: 100 mA
  • 12V Outputs 6

Speaker Selection

  • This decoder is optimized for 8 Ω speakers (not included).
  • This decoder uses and audio amplifier capable of supplying up to 2 Watts of power to an 8 Ohm load at maximum volume. An 8 Ohm speaker with a 1 Watt minimum power rating is recommended for use with this decoder as it comes out of the packageIf you are using an 8 Ohm speaker with a power rating of 2 Watts or less, you must reduce your master volume to prevent speaker failure or amplifier stress.
  • The amplifier(s) on a WOWSound product can support speakers with impedance ratings as low as 4 Ohms. A reduction in impedance will require a higher power dissipation rating (more Watts) on said speaker. The minimum power requirement for a 4 Ohm speaker is 4 WattsIf you are using a 4 Ohm speaker with a power rating of 4 Watts or less, you must reduce your master volume to prevent speaker failure or amplifier stress.
  • Speaker enclosures greatly increase speaker performance in most cases - improving the apparent volume by more efficiently directing the flow of air and reducing or eliminating destructive interference.

Decoder Specifications:

  • Size: 1.28" x .69" x .22" (32.5mm x 17.5mm x 5.6mm)
  • Connection: Integral 21-MTC connector
  • Motor Rating: 1.0 Amp Continuous, 2.0 Amp Peak
  • Functions: (6) 100mA outputs (400mA Total)
  • BEMF: Yes
  • Protocol: NMRA DCC Compliant
  • Additional Features: 


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