DATABASE NAME

     PASSRAIL:  Commuter railway network

DATABASE DESCRIPTION

     A geographic and topological network database of the U.S.
     commuter rail system, showing right-of-way alignments.

ORIGINATING AGENCY

     Federal Railway Administration

AGENCY RESPONSIBLE FOR MAINTAINING DATA

     Federal Transit Administration

CONTACT

     National Transportation Atlas Databases 
     Bureau of Transportation Statistics
     U.S. Department of Transportation
     Washington, DC  20590
     (202) 366-DATA
     Internet:  info@bts.gov

SOURCE

     1:100,000 USGS Digital Line Graphs supplemented by editing
     performed by the Volpe National Transportation Systems
     Center for the Federal Railway Administration

ACCURACY

     50 m (1650 ft) root-mean square positional accuracy

TYPE OF GIS DATABASE

     Line database with nodes and links

FILES/SIZE/NUMBER OF RECORDS

     Two ASCII files

     1)   passrail.pnt   node file contains node locations and
                         attributes
     2)   passrail.lin   link file contains link attributes and
                         shapes for links

     Approximate size of files:    424,000 bytes
     Approximate number of nodes:  3150
     Approximate number of links:  3250

FILE STRUCTURE

     The files are ASCII-comma delimited.  Character fields are
     enclosed in quotation marks.

     The Node File

   FIELD  ITEM                TYPE      REMARKS

     1    Node ID             Num       Unique identification
                                        number
     2    Longitude           Float     Longitude of node in
                                        decimal degrees (explicit
                                        decimal)
     3    Latitude            Float     Latitude of node in
                                        decimal degrees (explicit
                                        decimal)
     4    Station name        Char      Right justified
     5    Field 5             Num       Always empty.  Field not
                                        yet in use.

     The Link File

   FIELD  ITEM                TYPE      REMARKS

     1    "From" node number  Num       Node ID in passrail.pnt
     2    "To" node number    Num       Node ID in passrail.pnt
     3    Link ID             Num       Unique identification
                                        number
     4    Length              Float     Explicit decimal given
     5    Direction           Num       Always 0
     6    FIPS code           Num       Urban FIPS code, not used
     7    UZA                 Num       Urbanized Area code
     8    Type                Char      Type of system
                                        CR   Commuter rail
     9    Owner               Char      Alphanumeric identifier
                                        of the owning railroad
     10   Division            Char      Railroad division
     11   Subdivision         Char      Railroad subdivision
     12   Route name          Char      Name of route
     13   Run number          Char      Field not yet in use
     14   Route class         Char      Field not yet in use
     15   Service frequency   Num       Field not yet in use
     16   Filler              Num       Future use
     17   Filler              Char      Future use
     18   Filler              Float     Future use
     19   Filler              Float     Future use
     20   Filler              Num       Future use
     21   Filler              Num       Future use
     22   Filler              Char      Future use
     23   Filler              Char      Future use
     24   N                   Num       Number of following
                                        longitude-latitude pairs
                                        in decimal degrees
     25   Longitude of "From" Float     Explicit decimal} First 
     26   Latitude of "From"  Float     Explicit decimal} pair
     
          Long.-Lat. pairs    Float     Shape points of the link
          repeat N-2 times    Float     in pairs of long.-lat.

          Longitude of "To"   Float     Explicit decimal}  Final
          Latitude of "To"    Float     Explicit decimal}  pair


DISCUSSION

     No additional discussion