Add classic diesel power to your HO roster in minutes with WalthersMainline F7 diesels! Introduced in 1949 as railroads began dieselizing with a vengeance, they were equally at home in freight or passenger service. Delivered in a rainbow of color schemes for nearly every railroad in America, many served into the 1980s. Ready to take on any assignment on your HO railroad, features of WalthersMainline F7 locomotives include: