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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 TCS' website

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.

DC Mode: Decoder will automatically detect DC power. You can also configure how your lighting effects function on DC.

Variable Momentum: Allows you to make custom acceleration and deceleration curves.

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.

CAM: Use a positive voltage trigger to synchronize your chuff rate to your drivers' rotation.

Audio Assist®: TCS exclusive auditory feedback programming system. Program your decoder without the need to memorize 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.

True Scale Sound: A unique WOWSound feature which uses TCS’ exclusive auto-adjusting BEMF technology to automatically change the intensity of the chuff.

                           Prototype Mode also offers dynamic sound volumes which accurately model the real-life equivalent. Also includes pre-programmed acceleration and deceleration values.


  • Interface Type: Direct-Plug (21-Pin MTC)
  • Dimensions (L x W x H): 1.28" x 0.689" x 0.22" or 32.5mm x 17.5mm x 5.6mm
  • Scale: HO Scale
  • Continuous/Peak: 1.3/2.0 Amp
  • Total Functions: 8
  • Function Rating: 100 mA
  • 12V Outputs: 8
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