The ASD4 is a N-scale drop-in decoder designed specifically for Atlas locomotives. Compatible models include:

• Atlas:
  • GP7/GP9
  • GP15
  • GP30
  • GP35

For a complete list of compatible engines, refer to the installation pages.

Key Features:

• Back EMF Load Compensation:
  Provides superior slow speed control and high performance under load.

• Quiet Drive:
  Super-quiet motor control ensures "buzz"-free motor performance.

• DC Mode:
  Automatically detects DC power and allows configuration of lighting effects for DC operation.

• RailCom®:
  Enables communication between the decoder and the command station, supporting future feature expansions.

• Variable Momentum:
  Customize acceleration and deceleration curves for precise control.

• LED Support:
  No external resistors are required when connecting LEDs.

• Incandescent Bulb Support:
  Compatible with 12 Volt bulbs.

• Function Remapping:
  Use buttons 0 through 12 to control the decoder's lighting functions.

• Programmable Lighting Effects:
  Choose from 20 separate user-programmable lighting effects.

• Dimmable Brightness:
  Configure multiple brightness levels for LEDs or incandescent bulbs.

• Decoder Lock:
  Prevents accidental or unwanted programming while activated.

• Airwire™ Compatible:
  Fully compatible with Airwire™ operation.

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

With its advanced features and compatibility, the ASD4 decoder ensures optimal performance and customization for your Atlas locomotives.