Rail Guide is an online mapping resource focused on current and historic rail lines in North America. Its interactive map brings together information about present-day rail routes and railway history, helping visitors explore the rail landscape and view locations in geographic context. Map layers and categories include current and classic railways, early owners, points of interest, abandoned lines, and traffic. Users can also view satellite imagery, open locations in Google Maps or GeoHack, and copy coordinates from the map.

Rail Guide welcomes contributions to its map data. Visitors who want to submit information can provide mapping files in KML, KMZ, or GIS formats; the site also points to tools such as Google Earth Pro, CalTopo, Google My Maps, QGIS, and Map Warper for creating or preparing map data. The website provides contact details for comments and invites users to follow Rail Guide on Facebook. Overall, it serves rail enthusiasts and map users seeking an accessible way to explore railway routes, related locations, and historical rail information.