Union Pacific 1243 is a preserved 4-6-0 "Ten Wheeler" type steam locomotive on display at the Durham Museum in Omaha, Nebraska.

1243 is one of the oldest "Ten Wheelers" owned by the Union Pacific Railroad (UP).

1243 was built in 1890 by the American Locomotive Company's Cooke Works, originally numbered as UP No.

In 1990, the 1243 was cosmetically restored and transported on a flat car in a special train to Omaha, Nebraska, where it was placed on display at the Durham Museum in October 1996.

It currently sits inside the Trish and Dick Davidson Gallery exhibit, along with a variety of other railroad equipment.