I also take interest in the scars you can see on satellite view. Besides the lines themselves there are many disused buildings. Like this MBTA station outside Boston which has had no service in 50 years, https://www.google.com/maps/@42.3801645,-71.2466532,3a,75y,2... or this long-defunct passenger depot in Homestead, FL https://www.google.com/maps/@25.4712072,-80.4890484,3a,26.4y... ... https://www.google.com/maps/@29.4488141,-82.21584,3a,75y,138... McIntosh, FL (discovered this one following old grade on the satellite view)