SKU: 1029
$48.95 Buy Now

    The AMD4 is a N-scale drop-in decoder for Atlas locomotives. Examples include the following:


    • B23-7/B30-7/B36-7
    • C628/C630
    • Dash8-32BW/Dash8-40B/Dash8-40BW
    • DCC-ready RS11
    • DCC-ready GP-38, GP-40, GP-40-2
    • DCC-ready SD-7, SD-9, SD-35
    • DCC-ready U25B and C-420

    See the installation pages for a full list of compatible engines!

  • 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.

  • RailCom®:
  • This feature allows the decoder to talk to the command station. RailCom supports expansion for new features.

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

  • LED Support:
  • This product does not require external resistors when connecting LED's.

  • 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.

  • User-Loadable Speed Tables:
  • Configure custom speed curves and set speed limits.

    Interface Type
    Dimensions (L x W x H): 2.423" x 0.355" x 0.089" or 61.55mm x 9.02mm x 2.26mm
    Scale: N Scale
    Continuous/Peak: 1.0/2.0
    Total Functions: 4
    Function Rating: 80 mA
    12V Outputs
    LED Outputs
    Onboard LEDs

    Decoder Literature

    Download AMD4.pdf (461.75 KB)

    Comprehensive Guides

    Wiring Diagram

    One Year Goof Proof Warranty

    All decoders are covered by a one year goof proof warranty. Please return in a small box.
    You MUST register the failed decoder on our website at
    Follow the instructions on the website before returning any decoders to TCS.