From #openttdcoop wiki
When you delete pages, consider adding a redirect for them. Mainline was deleted, but this was actually a move, right? Where is the new page?
--Atdt 23:48, 22 October 2009 (UTC)
Since you don't seem to have a userpage i'll reply here. The article was in fact deleted and not moved. Pretty much everything in the article was outdated. For now there is sufficient info in the newly-written basic networking page, but I might consider creating a new page about mainlines.
--Mark 10:15, 24 October 2009 (UTC)