Download In State Plane Projection Here. ** In addition to the Railroad Centerlines feature class, the hyperlink download above also contains a generalized layer, as well as all tracks including spurs ** This dataset was created as a cartographic backdrop as well as for any analysis that requires railroads locations. The railroads were originally traced off aerial photography taken in April of 2000 using heads up digitizing in ESRI ArcGIS and later revised using photography taken in 2005, 2007, 2010, 2012 and 2013. This dataset should satisfy National Map Accuracy Standards for a 1:1200 product. Update Frequency: This dataset is updated on aweeklybasis.