The 133-foot-long locomotive is the only Big Boy to still travel the tracks.

For the first time ever, both coasts could receive a visit from the world's largest operating steam locomotive.

Cheyenne-based Big Boy 4014, the world's largest operating steam locomotive, will make its first ever coast-to-coast tour ...

Union Pacific has released new details on the schedule for its first-ever coast-to-coast tour of its 'Big Boy' historic ...

CHEYENNE, Wyo. — Union Pacific’s Big Boy will return to California this spring in the first leg of its planned coast-to-coast ...