Railroad Network

The CTA Railroad Network is a representation of the North American railroad system that contains every railroad route in the US, Canada, and Mexico that has been active since 1993. It is intended for logical network programming, traffic analyses, and mapping applications. Corporate structure, a key to the simulation of routing, is explicitly temporal, allowing historical studies and comparisons. Supporting data on interlines and corporate ancestry allow the construction of routable networks for a specific target date. The network is an extension of the Federal Railroad Administration's strategic network.

The network is distributed in two versions:
a) The raw version QN contains the full semantic content.
b) The current version QC is an easier-to-use operational freight network that omits inactive lines and contains only current operators, but incorporates interlines as network links.
and in two formats:
a) The official datasets are the ASCII "native format" files described in the documentation that will be most useful to programmers.
b) Derivative shapefile versions are also available for the convenience of GIS system users. Shapefiles do not include interlines or milepoints, but do explicitly translate historic owner into the current corporate operator.

Major differences from the documentation incorporated in edition 55 (2005 May):
1. Virtually all active US lines have 100 m geographic accuracy.
2. The subdivision field is now populated.
3. Network files available in ESRI shapefile format.
Further differences incorporated in edition 83 (2008):
1. Mexican corporate structure and geography updated. (Source code ‘M’objects in Canada and Mexico have alignments taken from the BTS NORTAD with approximately 1500 m accuracy.)
2. Traffic densities have been transcribed from the FRA strategic network of 2005 for all US lines above 1 million gross tons/yr. (Classes: 1=below 1M tons, 2=5M, 3=10M, 4=20M, 5=40M, 6=60M, 7=above.)
This edition is 93 (2009 March), incorporating routine maintenance and improved Canadian alignments.

View documentation Description of the CTA Railroad Network (ASCII text 53 KB)   go

View maps which illustrate network features go

Download raw network QN93
  QN93R in native format (8.3 MB)   go QN93V in shapefile format (8.2 MB)   go

Download current operational network QC93
  QC93R in native format (4.9 MB)  go QC93V in shapefile format (5.3 MB) go

Download supporting data: Interlines, Railroad ancestry, Subdivision list (0.2 MB compressed)  go
     View railroad reporting marks and ancestry only, wconv.txt.

Supporting programs: RHA (reformats native ASCII files into GIS formats), RQCFS (constructs the operational network QC from raw network QN), Arc/Info loading macros.
     Download source and executables in a single zipped file (28 KB) go

GIS details: Geographic accuracy is generally 100 m on active US lines (equivalent to a scale of 1:100,000), but is object-specific (see documentation). The geographic coordinate system is decimal degrees, datum NAD27. No ESRI PRJ file is included with the shapefiles, but if there were, it would look like this (cut and paste if needed):

GEOGCS["GCS_North_American_1927",DATUM["D_North_American_1927",SPHEROID["Clarke_1866",6378206.4,294.9786982]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]

Several royalty-free shapefile viewers are available on the Web that you can use to make on-screen maps of this network. Possibilities include:
1. ESRI ArcExplorer
2. PCI Geomatics Geomatica
3. Quantum GIS
4. MapWindow
You will have to install the program and point it to the downloaded shapefiles on your computer.

 

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Revised 2009 April                    WebMaster                    ORNL                    Disclaimer