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SKU: 1000

The A4X is four function HO-scale "drop-in" style mobile decoder for Atlas, Athearn, Kato, etc. locomotives.


Examples include the following:



  • F59PHI
  • F3


  • RS-1/RS-3/RS-11
  • C424
  • GP7


  • GP35


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


If you need more than four total lighting functions, or are using 1.5V bulbs, you should consider the A6X.


  • 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.


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