SteamLocomotive.com, Irfca.org and Up.com are some of the websites that provide information on locomotive specifications. These sites offer information on different types of locomotives ranging from steam to diesel to electric locomotives.
SteamLocomotive.com gives specifications about the Big Boy locomotives built between 1941 and 1945. This site gives detailed information about each Big Boy built with its current location and status.
Irfca.org gives specifications about diesel and electric locomotives, including the serial numbers. The powers for the locomotives quoted on this site are gross power for diesel locomotives and one-hour rating for electrics.
Up.com offers fuel specifications, pricing and requirements for locomotives. The site also offers different ways in which daily fuel price updates arrive from suppliers.