. . "one of eight" . "Union Pacific's ''Big Boy''" . . . . . "\\\"Big Boy\\\"" . "4884-1" . "\\\"Big Boys\\\"" . "Union Pacific Big Boy" . . "Big Boy" . . . "25.908" . "Union Pacific 4-8-8-4" . "4000 class \\\"Big Boy\\\"" . . "eight that remain in existence" . "25" . . . . . "4-8-8-4 \\\"Big Boy\\\" steam locomotives" . . "Union Pacific Big Boy#Preservation" . "Union Pacific Big Boy" . . "Union Pacific Big boy" . . . "UP Big Boy" . . . . . . "Big Boys\\\"" . . "3.3528" . "Big Boys" . . "Union Pacific Big Boy 4004" . "1941" . "\\\"Big Boy\\\" locomotive" . "1941" . . "Union Pacific 4000 Class" . . "Union Pacific Big Boy 4005" . . . "4" . . "2019-05-01" . "4.8768" .