MERG (Model Electronic Railway Group) http://www.merg.org.uk/index.php This is really an international group, based in the UK, which was set up to promote interest in the use of electronics and computers to all aspects of railway modelling. They are not manufacturers, but do provide circuits, schematics, and kits to build many DCC devices. There are forums, user groups, kits, quite a lot to assimilate. I'll focus on the DCC products, mostly boosters, command stations, cabs, decoders, etc. This page is in the beginning stages, so not much here yet.