EMD F7 A-B Set - Standard DC -- Amtrak(R) #104, #152 (Phase I, silver, red, blue, black)Details: Amtrak(R) #104, #152 (Phase I, silver, red, blue, black) 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