>Challenger</a></i></td>
<td>Union Pacific</td>
<td><a href="//en.wikipedia.org/wiki/Union_Pacific_3985" title="Union Pacific 3985">3985</a></td>
<td><a href="//en.wikipedia.org/wiki/American_Locomotive_Company" title="American Locomotive Company">ALCO</a></td>
<td>1936–43</td>
<td>Steam</td>
<td><a href="//en.wikipedia.org/wiki/4-6-6-4" title="4-6-6-4">4-6-6-4</a></td>
<td>485 t</td>
<td>6,200 <a href="//en.wikipedia.org/wiki/Horsepower" title="Horsepower">horsepower</a> (4,623 <a class="mw-redirect" hr