EMD SD40-2
Why this 3,000-horsepower locomotive became a North American railroad legend.
Explore the SD40-2 βWELCOME TO RAILROAD CENTRAL STATION
Explore locomotives and railcars, understand how railroads work, learn how rail changed America, hear real stories, and discover model railroading.
Have a question about trains?
Our AI Conductor is here to help!
Jump into locomotive profiles, freight and passenger equipment, work trains, railroad history, operating technology, model railroading and answers to common train questions.

Steam, diesel and modern road power with specifications, identification and photographs.
Browse locomotives β
Boxcars, covered hoppers and the growing guide to the cars that carry freight.
Explore freight cars β
Coaches, sleepers, diners, dome cars and passenger equipment past and present.
Explore passenger cars β
Snow-fighting, track maintenance, cranes and the equipment that keeps railroads operating.
Explore work trains βBrakes, couplers, distributed power, train handling and railroad operations explained.
Learn how trains work β
How railroads shaped commerce, communities, workers and American history.
Explore railroad history β
Fuel, horsepower, hauling, speed and surprising railroad facts.
Discover railroad facts β
Model railroad scales, layouts, accessories and practical hobby information.
Visit the Model Railroading Depot β
Stories and memories from the people who experienced railroading.
Explore railroad stories βStraight answers to questions people commonly ask about freight trains and locomotives.
VOICES FROM THE RAILS
Listen to archival interviews with people who worked aboard America's trains, beginning with Railway Mail Service clerks whose memories are preserved by the Smithsonian.
EXPLORE IN PICTURES
Browse the site visuallyβfrom locomotives and passenger cars to work equipment, history and the people who made railroading happen.
FEATURED THIS WEEK
A locomotive, a piece of American railroad history, and one of the questions railfans ask most.

Why this 3,000-horsepower locomotive became a North American railroad legend.
Explore the SD40-2 β
The 1869 connection that transformed travel, commerce and the American West.
Read the story β
Learn why railroads place power throughout long freight trains.
Find out why βMODEL RAILROADING
New to the hobby or expanding a layout? Explore scale guides, conversion tools, layout information and our carefully selected model-railroad recommendations.
Visit the Model Railroading Depot βFEATURED HISTORY
Discover how railroads transformed commerce, agriculture, industry, cities, migration, timekeeping and the American supply chainβand learn about the people and communities affected along the way.
TOOLS & IDENTIFICATION
Try visual guides for locomotives, freight cars, distributed power, air brakes and railroad signals.