Category:Union Pacific 3900

<nowiki>Union Pacific Challenger; Union Pacific Challenger; Union Pacific Challenger; 挑战者型机车; Challenger; יוניון פסיפיק "צ'לנג'ר"; Union Pacific Challenger; Union Pacific Challenger; 挑战者型蒸汽机车; UP-Klasse 3900; Union Pacific Challenger; Union Pacific Challenger; Union Pacific Challenger; 挑战者型机车; 挑戰者型蒸汽機車; Dampflokomotive; kelas (tipe) lokomotif; lokomotywa parowa; five classes of American simple articulated 4-6-6-4 locomotives; five classes of American 4-6-6-4 locomotives; 挑戰者型機車; Union Pacific 3900; 挑战者型蒸汽机车; Union Pacific 4664; Union Pacific 4-6-6-4; Union Pacific 3900; Union Pacific 3900; 挑战者型蒸汽机车; Union Pacific 4664; Union Pacific 4-6-6-4</nowiki>