•YEARS BUILT: 1941 to 1944
•MANUFACTURER: Alco
•OPERATED ON: Union Pacific
•NAME: Big Boy
•QUANTITY: 25
•BOILER PRESSURE: 300 psi
•KNOWN FOR: Among the heaviest and most powerful reciprocating-piston steam locomotives ever built
•STATUS: Eight preserved: 4004 in Cheyenne, Wyo.; 4005 at Forney Museum in Denver; 4006 at Museum of Transport in St. Louis; 4012 at Steamtown in Scranton, Pa.; 4014 under restoration by Union Pacific; 4017 at National Railroad Museum in Green Bay, Wis.; 4018 at Museum of the American Railroad, Frisco, Texas; 4023 at Lauritzen Gardens, Omaha, Neb.
Actually, 4014 has since now been restored. Why is there no image of her on an excursion on this page?