Commercial Modeling
AC  Models - Manufacturer of cast-metal N scale freight cars.
Athearn - Manufacturer of HO scale models.
Atlas - Manufacturer of O, HO, and N scale models.
BLMA - Best Looking Models Around.  Custom painting and detail parts in N scale.
Highball Graphics Decals - Custom Decals in all scales.
JnJ Trains - Unique N scale shells and detail parts.
Kato - Manufacturer of HO and N scale models.
LBF Company - HO and N scale freight cars in quantity.
Logic Rail Technologies - Supplier of signalling components and controllers for all scales.
Tony's Train Exchange - DCC supplier
Walthers - The location for your modeling needs.

Modeling Clubs and Layouts
New England, Berkshire & Western - RPI Model RR Society.
Rochester Institute of Technology Model RR Club - The RITMRC.
North Raleigh Model RR Club - An NTRAK club based in the Research Triangle Park area of North Carolina.

Railfanning Related
Boston Line Railfan Page - Railfanning CSX's Boston Line.
The Bull Sheet - All the info you need regarding CSX operations today.
B.C. Junction Embroidered Railroad Garments - Caps, Golf Shirts, Jackets with your favorite railroad logos.  40% off first purchase....FREE samples!
Caronlina Rails - Railfanning in the Carolinas.
Colorado Rails - Photos from the Colorado area, courtesy of Jim Burrill.
CSX Photo Archives - Collection of CSX locomotives with over 7,200 photos of 5,400 units
Dave Honan's Ferroequinology - Railfanning from the Albany, NY and Terra Haute, IN areas.
Diesel - Dedicated to dissecting and divulging info on the diesel locomotive.
Dividing Creek - Railfanning in Southern NJ, brought to you by a Railpace editor!
Eastern Railroad News - Magazine for the eastern railfan.
Greater Capital District Railfan Association - Railfaining in NY's Capital District.
Greg's Railfanning Site - Fellow RPI student and RMRRS club member Greg Snook's page.
Jeff & Josh Lubchansky's Train Site - Lots of Railroad photos.
Krug's Homepage - The pages of Al Krug, BNSF engineer.
Milepost 1147.2 - Railfanning on the BNSF Stockton Subdivision.
Northeast Railfan Pages - Pictures from the northeast.
Railspot - Great info including Reporting Marks, Train Symbols, and Engine Histories.
Under Western Skies - Contemporary Western Railroading through the lenses of Jerry Sharp.
Western Rails - Railfanning in the west.

Resources
Modeltrain.net - Links to manufacturers and clubs, as well as chat and BBs
The Railroad Paintshop - Your source for prototype drawings to color.
Rails USA - Directory of links to everything from Railfanning to Model Railroad Manufacturers.

Railroads
Burlington Northern Santa Fe
Canadian National
Canadian Pacific
CSX Transportation
Guilford Rail System
Norfolk Southern
Union Pacific
Vermont Railways