Big Boy rounds the Horseshoe Curve

Union Pacific Big Boy No. 4014 approaches the crowd gathered at the Horseshoe Curve on Saturday morning as the engine prepared to make its way back west. Mirror photo by Patrick Waksmunski

Union Pacific Big Boy No. 4014 lead engineer Ed Dickens (right) waves to the crowd at the Horseshoe Curve on Saturday morning. Mirror photo by Patrick Waksmunski

A crowd of railfans greeted Union Pacific Big Boy No. 4014 at the Horseshoe Curve on Saturday morning. Mirror photo by Patrick Waksmunski

Union Pacific Big Boy No. 4014 lead engineer Ed Dickens waves to and photographs the crowd at the Horseshoe Curve on Saturday morning. Mirror photo by Patrick Waksmunski

Union Pacific Big Boy No. 4014 is greeted by the crowd as it pulls into a stop at the Horseshoe Curve on Saturday morning. Mirror photo by Patrick Waksmunski

The crowd departs the Horseshoe Curve after Union Pacific Big Boy No. 4014 leaves the Horseshoe Curve on Saturday morning. Mirror photo by Patrick Waksmunski