The K1D4 is an N-scale drop-in decoder designed for Kato and Athearn locomotives. Examples of compatible models include:

Compatible Locomotives

Kato:

• SD70ACe
• SD40-2
• GG1
• SD70M

Athearn:

• SD75I

For a full list of compatible engines, refer to the Installation Pages.

Important Note

This version of the K1D4 does not include the copper tabs that slip over the motor contacts on the locomotive. Use this version if you need to attach your motor leads using wires.

Key Features

• Back EMF Load Compensation: Provides superior slow-speed control and high performance under load.
• Quiet Drive: Ensures super-quiet motor control for "buzz"-free motor performance.
• DC Mode: Automatically detects DC power and allows configuration for lighting effects on DC.
• RailCom®: Enables the decoder to communicate with the command station, supporting future feature expansions.
• 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: Buttons 0 through 12 can control the lighting functions of this decoder.
• Programmable Lighting Effects: Choose from 20 user-programmable lighting effects.
• Dimmable Brightness: Configure multiple brightness levels for LEDs or incandescent bulbs.
• Decoder Lock: Prevents accidental or unwanted programming when activated.
• Airwire™ Compatible: Fully compatible with Airwire™ operation.
• User-Loadable Speed Tables: Customize speed curves and set speed limits.

Specifications

• Interface Type: Drop-In
• Dimensions (L x W x H): 2.705" x 0.38" x 0.059" (68.7mm x 9.64mm x 1.5mm)
• Scale: N Scale
• Continuous/Peak Current: 1.0/2.0 Amp
• Total Functions: 4
• Function Rating: 80 mA
• 12V Outputs: 2
• LED Outputs: 2
• Onboard LEDs: 2

This decoder combines advanced functionality with user-friendly features, making it a reliable choice for enhancing your locomotive's performance and lighting customization.