I read that the gentleman "Mr. Thor Sheil" passed in 2018, it looks like the service he was using to maintain his site has shut it down. It would be a shame to lose all of those great layout pictures. Maybe OGR could get the content and host it too? http://www.thortrains.net
Thor Sheil has passed away (ogaugerr.com)
(Update as of January 2021) Thanks to great work documented below, the site is available as http://thortrains.us/