South Pennsylvania Railroad -  Intriguing site by Russell Love documenting his detailed research of this line that was surveyed but not built.
Rails in Virginia -  Nice site by Jeff Hawkins.
Brian McCamish's Abandoned Railroad Pages -  Covering Oregon, Washington and California.  Among the best abandoned railroad pages I've seen!  Chocked full with history, photos, maps and links.
MD Rails (mid-Atlantic region) -  Interesting photos of RRs in the mid-Atlantic, plus Florida and others. Abandoned RRs in "Almost Gone".
Ghost Railroads of Nebraska -  Reviewed on this site.  This and other great railroad titles are available from South Platte Press.
Non-Monon Railroad Page -  Tom Kepshire's non-Monon railroad page.
Bygone Monon  -  Bygone Places Along The "Hoosier Line"
Railserve -  An excellent resource with lots of links.
Big Stony Railroad  (VA,WVA) Dean Carroll's web site containing photos and history on this line that became part of the Norfolk & Western.
Route of the Hiawatha & Taft Tunnel Preservation Society Home Page  (ID, WA) - The Milwaukee Road's Puget Sound extension.  The largest abandoned RR route now a cool bike path in Washington.
Marietta & Cincinnati RR  Ohio Shortline  -  One of the earliest abandoned RRs with a "station by station" tour.
CRRNJ TERMINAL HISTORY  (NJ)  -  The Central of New Jersey's Communipaw station.
Ghosts of the Southline (AZ,NM) The El Paso & Southwestern RR
Taplines - Shortline Railroads, Narrow Gauge Railroads and Industrial Railroad Photographs and History  (GA, FL, WV).

Historical USGS Maps   -    Very helpful tool for railroad archaeologists!!
Scott's Railroad Archaeology Page   -  Covering Abandoned Branches of the Boston and Maine Railroad in Southern New Hampshire and Northeastern Mass.
Railways of the Past   -    Web site covering abandoned railroads in Canada.
Carolina Rails  -    Great web site covering railroads in the Carolinas.
Railroaddata.com  -   Good site with lots of links.
Maco Light Links  -  Links dealing with the Maco Light ghost legend of North Carolina can be found on this page.
Smokey Mountain Railroad  -  Great site about this abandoned Tennessee railroad.
West Virginia Rails-to-Trails Council  -  Excellent web site of a very active organization.
South Carolina Rail-Trails  -  This web site has a complete list of SC railroad lines abandoned since 1970 -- over 763 miles in all.
Rails to Trails Conservancy - This group is dedicated to preserving abandoned rail lines for use as recreational trails.
SPV's Railroad Atlases - These atlases show existing and abandoned railroad lines. 
Ghost Railroads of Tennessee by Elmer G. Sulzer - See the write-up above.
Ghost Railroads of Kentucky by Elmer G. Sulzer - See the write-up above.
Ghost Railroads of Indiana by Elmer G. Sulzer - This and the other 2 books in this classic series have been reprinted.  You may want to grab a copy while they still are available.  I hope to one day put together similar compilations for other states.
Right of Way - A Guide to Abandoned Railroads - This guide is still available and is an excellent resource.
Pennsylvania Rails-to-Trails Page -  Pennsylvania has done a great job of documenting the conversion of abandoned railroads to trails.
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Pennsylvania Rails-to-Trails Page -  Pennsylvania has done a great job of documenting the conversion of abandoned railroads to trails.
Right of Way - A Guide to Abandoned Railroads - This guide is still available and is an excellent resource.
Ghost Railroads of Indiana by Elmer G. Sulzer - This and the other 2 books in this classic series have been reprinted.  You may want to grab a copy while they still are available.  I hope to one day put together similar compilations for other states.
Ghost Railroads of Kentucky by Elmer G. Sulzer - See the write-up above.
Ghost Railroads of Tennessee by Elmer G. Sulzer - See the write-up above.
SPV's Railroad Atlases - These atlases show existing and abandoned railroad lines. 
Rails to Trails Conservancy - This group is dedicated to preserving abandoned rail lines for use as recreational trails.
South Carolina Rail-Trails  -  This web site has a complete list of SC railroad lines abandoned since 1970 -- over 763 miles in all.
West Virginia Rails-to-Trails Council  -  Excellent web site of a very active organization.
Smokey Mountain Railroad  -  Great site about this abandoned Tennessee railroad.
Maco Light Links  -  Links dealing with the Maco Light ghost legend of North Carolina can be found on this page.
Railroaddata.com  -   Good site with lots of links.
Carolina Rails  -    Great web site covering railroads in the Carolinas.
Railways of the Past   -    Web site covering abandoned railroads in Canada.
Scott's Railroad Archaeology Page   -  Covering Abandoned Branches of the Boston and Maine Railroad in Southern New Hampshire and Northeastern Mass.
Historical USGS Maps   -    Very helpful tool for railroad archaeologists!!
Big Stony Railroad  (VA,WVA) Dean Carroll's web site containing photos and history on this line that became part of the Norfolk & Western.
Route of the Hiawatha & Taft Tunnel Preservation Society Home Page  (ID, WA) - The Milwaukee Road's Puget Sound extension.  The largest abandoned RR route now a cool bike path in Washington.
Marietta & Cincinnati RR  Ohio Shortline  -  One of the earliest abandoned RRs with a "station by station" tour.
CRRNJ TERMINAL HISTORY  (NJ)  -  The Central of New Jersey's Communipaw station.
Ghosts of the Southline (AZ,NM) The El Paso & Southwestern RR
Taplines - Shortline Railroads, Narrow Gauge Railroads and Industrial Railroad Photographs and History  (GA, FL, WV).

Railserve -  An excellent resource with lots of links.
Bygone Monon  -  Bygone Places Along The "Hoosier Line"
Non-Monon Railroad Page -  Tom Kepshire's non-Monon railroad page.
Ghost Railroads of Nebraska -  Reviewed on this site.  This and other great railroad titles are available from South Platte Press.
MD Rails (mid-Atlantic region) -  Interesting photos of RRs in the mid-Atlantic, plus Florida and others. Abandoned RRs in "Almost Gone".
Brian McCamish's Abandoned Railroad Pages -  Covering Oregon, Washington and California.  Among the best abandoned railroad pages I've seen!  Chocked full with history, photos, maps and links.
Rails in Virginia -  Nice site by Jeff Hawkins.
South Pennsylvania Railroad -  Intriguing site by Russell Love documenting his detailed research of this line that was surveyed but not built.