The IMF4-NF is a N-scale drop-in decoder which is designed for InterMountain F-unit locomotives.

Examples include the following:

• F3A/B
• F7A/B
• F9B

NOTE: This version of the IMF4 is designed for the newer style InterMountain frame where the motor is connected to the control board via wires instead of the brass feet.

• 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.

Specs:

• Interface Type: Drop-In
• Dimensions (L x W x H): 0.47” X 0.179” X 2.158” or 11.93mm. X 4.54mm. X 54.81mm
• Scale: N Scale
• Continuous/Peak: 1.0/2.0 Amp
• Total Functions: 3
• Function Rating: 80 mA
• 12V Outputs: 4
• LED Outputs: 4