The IMFP4 is a N-scale drop-in decoder which is designed for InterMountain FPA-unit locomotives. Examples include the following:
InterMountain:
- FP7A
- FP9A
See the installation pages for a full list of compatible engines!
NOTE: This version of the IMFP4 is designed for the older style InterMountain frame where the motor is connected to the control board via brass feet.








