The world’s largest operating steam train is in Denver. Union Pacific’s legendary Big Boy No. 4014 locomotive made a pit stop in the Mile High City on Friday.
It first rode the rails in the 1940s until its retirement in 1961.
It came to Denver from Cheyenne, Wyoming, and makes the return trip on Saturday.
There is no public viewing in Denver, but the train will stop at the Colorado Model Railroad Museum in Greeley in the morning…