Big Boy No. 4014 was delivered to Union Pacific in December 1941. The locomotive was retired in December 1961, having traveled 1,031,205 miles in its 20 years in service. Now, Union Pacific is undertaking the movement and restoration of one of the world's largest steam locomotives.

No. 4014 will be moved from its display location in Pomona, Calif., to Cheyenne, Wyo., where it will undergo restoration that is anticipated to take three to five years.

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