ATHG71621 HO DDA40X Diesel Locomotive UP #6901 - DCC SoundUP FEATURES: Beacon (Flash function in DCC only) Classification lights (Function in DCC only) Number board lights Working Truck lights Separate see through walkways MU hoses Built exclusively for Union Pacific by EMD between 1969 & 1971, the DDA40X Centennial locomotives were the modern equivalent of the railroads famed Big Boy steam locomotives. These massive 98 foot double engine diesels were UPs mainstay hotshot power for a decade until they were