3.1M Commanders on Instagram: "On January 28, 1986, millions watched live as the Space Shuttle Challenger lifted off from Kennedy Space Center—only to disintegrate 73 seconds later. All seven crew members were lost, including Christa McAuliffe, the schoolteacher chosen to be the first civilian in space. The event left her students and viewers nationwide devastated. Investigators traced the disaster to a failed O-ring in one of the solid rocket boosters, a flaw worsened by the unusually cold temp

A tribute to the Union Pacific 4-6-6-4 Challenger locomotive, the 3985 Union Pacific 3985 is a four-cylinder articulated 4-6-6-4 "Challenger"-type steam locomotive built in July 1943 by the American Locomotive Company (ALCO) of Schenectady, New York, for the Union Pacific Railroad. No. 3985 is one of only two Challengers still in existence and the only one to have operated in excursion service. No. 3985 operated in revenue service until 1957. It was then stored in the roundhouse in Cheyenne, Wyo

Documentary on Union Pacific 3985.