Locomotives: The Modern Diesel and Electric Reference
The Encyclopedia of Trains and Locomotives: From 1804 to the Present Day
How Steam Locomotives Really Work (Popular Science)
GE Evolution Locomotives
EMD Locomotives
Electric Locomotives (Enthusiast Color)
GE Locomotives: 110 Years of General Electric Motive Power
Modern Diesel Locomotives (Enthusiast Color Series)
The Locomotive Engineman's Manual