EOL Model Trains also has a large inventory of railroad books; some quite rare. Here's what we currently have:
The Collected Colorado Rail Annual - Hardcover with dust jacket
Colorado Rail Annual #9 - Tin Feathers and Gasoline Fumes - Hardcover with dust jacket
Colorado Rail Annual #10 - Narrow Gauge to Central and Silver Plume - Hardcover with dust jacket
Colorado Rail Annual #11 - Hardcover with dust jacket
Colorado Rail Annual #12 - The South Park Line - Hardcover with dust jacket
Colorado Rail Annual #13 - Florence & Cripple Creek Railroad - Hardcover with dust jacket
Colorado Rail Annual #14 - Hardcover with dust jacket
Colorado Rail Annual #15 - Idaho Montana Issue - Hardcover with dust jacket
Colorado Rail Annual #16 - Short Line to Cripple Creek - Hardcover with dust jacket
Silver San Juan by Mallory Hope Ferrell - Hardcover with dust jacket
C&Sng by Mallory Hope Ferrell - Hardcover with dust jacket
The Moffat Road by Edward T. Bollinger and Frederick Bauer - Hardcover with dust jacket
Rails That Climb by Edward T. Bollinger - Hardcover with dust jacket
Nevada County Narrow Gauge by Gerald M. Best - Hardcover with dust jacket
Mile-High Tolleys by William C. Jones, F. Hol Wagner, Gene C. McKeever, and Kenton Forrest - Hardcover with dust jacket
The Switzerland Trail of America by Forest Crossen - Hardcover
The Crystal River Pictorial by Dell McCoy and Russ Collman - Sundance Publications - Hardcover with clear jacket protector
The Rio Grande Narrow Gauge by - John B Norwood - Hardcover with dust jacket
Rio Grande... To The Pacific! by Robert A. LaMassena - Sundance Publications - Hardcover with clear jacket protector
Rio Grande Steam Locomotives Standard Gauge by Donald Heimberger - Hardcover with dust jacket
Never on Wednesdays - The First Decade of the Rio Grande Zephyr by Richard Loveman and Mel Patrick - Hardcover with dust jacket
The Compendium of Signals by Roger F.R. Karl - Softcover
Narrow Gauge Pictorial Volume I - Rio Grande Southern and D&RGW Motive Power - Softcover
Narrow Gauge Pictorial Volume II - Passenger Cars of the D&RGW - Softcover
Narrow Gauge in the Rockies by Beebe & Clegg - Hardcover with dust jacket
Vanishing Varnish by Gregory LePak - Hardcover with dust jacket
Rails to the Rockies by Gregory LePak - Hardcover with dust jacket
Turbines Westward by Thos R. Lee - Hardcover with dust jacket
The Domeliners by Patrick C. Dorin - Hardcover with dust jacket
Rio Grande Diesels - A Pictorial History Vol 1 by Joseph A. Strapac - Softcover
Rio Grande Diesels - A Pictorial History Vol 2 by Joseph A. Strapac - Softcover
Denver, South Park & Pacific Memorial Edition by M.C. Poor - Hardcover with dust jacket
The Mineral Belt Set (Sold as set of three books)
The Mineral Belt Volume I Old South Park - Denver to Leadville by David S. Digerness - Sundance Publications - Hardcover with clear jacket protector
The Mineral Belt Volume II Old South Park - Across the Divide by David S. Digerness - Sundance Publications - Hardcover with clear jacket protector
The Mineral Belt Volume III Georgetown - Mining - Colorado Central Railroad by David S. Digerness - Sundance Publications - Hardcover with clear jacket protector
The Rainbow Route - An Illustrated History by Robert E. Sloan and Carl A. Skowronski - Sundance Publications - Hardcover with clear jacket protector
Western Pacific Steam Locomotives, Passenger Trains and Cars by Guy L. Dunscomb and Fred A. Stindt - Hardcover with dust jacket
Colorado Railroads Chronological Development by Tivis E. Wilkins
Some Classic Trains by Arthur D. Dubin - Hardcover with dust jacket
More Classic Trains by Arthur D. Dubin - Hardcover with dust jacket
Along an Open Track by Ed & Sally Kochanek
Narrow Gauge Nostalgia - A Compendium of California Short Lines by George Turner
A Colorado Midland Guide and Data Book by Edward M. "Mel" McFarland
Western Pacific's Diesel Years by Joseph A. Strapac - Softcover
Roaring Fork Valley, An Illustrated Chronicle by Len Shoemaker - Sundance Publications - Hardcover with clear jacket protector
CZ - The Story of the California Zephyr by Carl R. Zimmerman - Hardcover with dust jacket
Kary Northwest - The Story of a Branch Line Railroad by Donovon L. Hofsommer
Historic Alpine Tunnel by Dow Helmers - Softcover
American Narrow Gauge by John Krause
Leadville: Colorado's Magic City by Edward Blair - Hardcover with dust jacket