Description: NJDOT initiated a project to update their railroad GIS database in February 2016. The database was reorganized to combine multiple rail line layers into one layer, new Railroad IDs (RR_ID) were assigned, the Linear Referencing System was updated, and database and topology errors resolved. The Railroad IDs now are an alpha-numeric identifier. The first part of the RR_ID corresponds to the RR Name and the second part of the RR_ID corresponds to the type of RR (Main Line (M), Secondary Line (S), Spur (R), or Military (T)). Spurs also include the milepost that they intersect the main or secondary rail line in their RR_ID. In order to update linework locations and names the following sources were referenced: New Jersey ortho-imagery from 1995, 2002, 2007, 2012, and 2015, Conrail track charts and maps from 1997-1999, NJDOT's At-Grade Crossing database from the Inspection Division, other historical maps, and websites detailing rail lines now dedicated to tourism and rail lines turned into recreational trails. Due to the historical nature of railroads, truncations, mergers, abandonment, or realignment may result in physical or milepost gaps in the GIS linework. In addition, some rail lines may not start at milepost 0. Details on the source of rail line's LRS are included in the rr_ln_Comments table. Additional bridge and at-grade crossing locations were also integrated into the database. This update was completed in September 2018.