In this video of my N Gauge Model Railway layout Elvenhome, I can update you on the plans for building a control panel for Elvenhome including the electronics that will allow me to retro-fit LED directional lights; I can also update with the plans for the Underground layout and the electronics that will control that. Two running sessions to balance all the talk, all with LMS engines in Crimson Lake - although two of them had to wait for preservation to be painted in that colour.
The video I mention in that explains the units I am going to be using to control the LEDs can be found here
https://youtu.be/FdfYuyOye3E?si=RiKjJd-Ak7gkrGmV
Clive Heathcote's website is
https://www.heathcote-electronics.co.uk/heathcote_product_index.html