Rail Map Online has been around since 2013 or so, but it only came to my attention recently. It’s an interactive map of every rail line and station that has ever existed in Great Britain and Ireland, with U.S. rail lines in the pipeline. Keep in mind that it’s a hobby project: “The U.K. map is mostly finished, although there’s always room for improvement. The U.S. map is a work in progress, and will take many years to complete.” [Tim Dunn]