Noted on the front page of the Transport for North Community Conference yesterday as a sponsor - a new name to me -
http://railusergroups.net .
Welcome to this web site for rail user groups
We plan to provide free links and hosting for rail user groups affiliated to Railfuture
[snip]
Railfuture's
RUG» pages offer further links to rail user groups and other organisations
To contact us for more information on the services we can provide, please email
info@railusergroups.netPlease note the Rail User Groups listed on this website are all affiliated to Railfuture. However, this website is managed entirely independently of Railfuture, which has asked us to state that it has no involvement in its content or appearance and takes no responsibility for it.
Railfuture has a far more thorough (I hesitate to say "complete" but it's a pretty long list) of local rail user groups at
https://www.railfuture.org.uk/Rail+User+Groups and links there to most of them, together with onward links to even fuller lists which include groups they're aware of which have not chosen to affiliate with them.