The ALD4 is a N-scale drop-in decoder designed specifically for Atlas locomotives. Compatible models include:

• Atlas:
  • SD50
  • SD60

For a complete list of compatible engines, please 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 for "buzz"-free motor performance.

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

• RailCom®:
  Enables communication between the decoder and the command station, supporting expansion for new features.

• Variable Momentum:
  Customize acceleration and deceleration curves to suit your needs.

• 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 lighting functions.

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

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

• Decoder Lock:
  Prevent accidental or unwanted programming while this feature is activated.

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

• User-Loadable Speed Tables:
  Customize speed curves and set speed limits for optimal control.

This high-performance decoder is packed with versatile features to enhance your model train experience!