Union Pacific 3985

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Union Pacific Challenger redirects here. For the named passenger train, see Challenger (passenger train).

<tr><th>Configuration</th><td>4-6-6-4</td></tr><tr><th>Gauge</th><td>4 ft 8¹⁄₂ in (1435 mm)</td></tr><tr><th style="color: black; background: #cc9966; text-align: center;">Career</th><td style="color: black; background: #cc9966; text-align: center;">Union Pacific</td></tr><tr><th>Number</th><td>3985</td></tr><tr><th>Nicknames</th><td>"Challenger"</td></tr><tr><th>Disposition</th><td>operates in occasional excursion service</td></tr>

**Union Pacific 3985**
Power type	Steam

Union Pacific 3985 or UP 3985 is a 4-6-6-4 steam locomotive owned by Union Pacific Railroad. It is the largest operating steam locomotive in the world. It was originally retired and placed on display, but later a group of UP volunteers overhauled it and returned it to operable condition. It is now used for excursion trains. It is one of only two "Challenger" types in existance, the other being UP 3977 on display in North Platte, Nebraska.