https://www.merg.org.uk/

MERG

Quote from their website:-

MERG (Model Electronic Railway Group) is an international, UK based society promoting interest in the application of electronics & computers to all aspects of railway modelling. Our aim is to introduce modellers to the use of electronics to control and enhance their layouts, whether you are using techniques such as DC, DCC or Radio Controlled, manual or computer operated. We do this through our vast library of information, video tutorials, local groups and extensive range of electronic kits, which range from the simple to the sophisticated.