GREELEY, Colo. — Colorado has two opportunities to catch the world's largest operating steam locomotive over the next week as part of its limited fall travel schedule.

Union Pacific Railroad's Big Boy No. 4014 returns to the state this fall after a trip earlier this year in July. The train measures approximately 132 feet long and weighs 1.2 million pounds.

The behemoth locomotive is one of 25 that were built for Union Pacific during World War II. Eight were maintained, but Big Boy No. 4014 is the only one still operational.

You can see it for yourself on Tuesday, September 30, when Big Boy No. 4014 will depart Cheyenne, Wyoming at approximately 11 a.m. and make it to Greeley, Colorado around 12:45 p.m.

Then around 12:30 p.m. on Wednesday, October 1, it will travel from Eaton, Colorado

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