Union Pacific's Big Boy steam locomotive 4014 steaming through Utah in May.

Union Pacific’s historic Big Boy steam locomotive No. 4014 is touring the Union Pacific system throughout 2019 to commemorate the transcontinental railroad’s 150th anniversary.[quote_box_right]Tips from UPRR

  • Stand back at least 25 feet from all railroad tracks.
  • Railroad tracks, trestles, yards and right-of-way are private property – please do not trespass.
  • Never assume tracks are abandoned or inactive – ALWAYS expect a train.


The Big Boy’s return to the rails is the product of more than two years of meticulous restoration work by the Union Pacific Steam Team. No. 4014 is the world’s only operating Big Boy locomotive.

Oct. 16, it is expected to stop in Gila Bend around 12:30 p.m. and then pass through Maricopa (but not stop) on its way to Casa Grande to stay overnight. Maricopa’s Dale Brinkman estimates it will roll through Maricopa around 2:15 p.m.

UP says, due to the dynamic nature of these operations, running times and scheduled stops are subject to change. See the current schedule.

The 25 Big Boy reciprocating steam locomotives were manufactured 1941-44, with engines that weighed over 700,000 pounds. Eight are known to still be around. UPRR reacquired No. 4014 for the purpose of restoring it.