Last Updated: 16 June 2025

This guide covers the following models:

  • Union Mills Class J25 1988 in LNER Black

Union Mills Tender Drive Conversion

There isn't enough room in the tender to a decoder without milling out some of the metal, instead of doing this we hide the decoder on the footplate out of sight. Follow the Union Mills J39 guide for detailed conversion instructions, as the steps are exactly the same.

Convert Union Mills Class J39 loco to DCC