The welshhighland forums operate in friendly parallel with, but independently of, the Yahoo Group, and were created in the hope of addressing some of the drawbacks experienced by a number of present and past members of the Yahoo Group, which is not always as relevant or civilised as it was intended to be.
The forums are hosted by FreeForums; the address for registration (and thereafter for access to the forums) is: http://welshhighland.freeforums.org
The Yahoo Group WelshHighland is defined as "a general discussion group for history, preservation, modelling, rebuilding and operating of the Welsh Highland Railway and its predecessors". Most members use it as an email list, but you can opt to read messages via the web instead.
The list is hosted by Yahoo! Groups. See http://groups.yahoo.com/group/WelshHighland for further details and how to join. You will need to sign up for a Yahoo! ID if you don't already have one.