Those locomotives have already had smaller 12-cylinder diesel engines installed to replace their larger 16-cylinder engines, according to Union Pacific spokesman Aaron Hunt.

Union Pacific has put 1,500 locomotives in storage. Union Pacific volumes decline 8% so far in 2016.

Union Pacific has unveiled its Abraham Lincoln commemorative locomotive, honoring the president who signed the bill creating Union Pacific as part of the transcontinental railroad.

Union Pacific Railroad is celebrating Presidents Day with the unveiling of its newest commemorative locomotive honoring President Abraham Lincoln, who created the railroad and connected the nation ...

The world's largest operating steam locomotive - Union Pacific's Big Boy No. 4014 - will roll through Houston in October.

Union Pacific's famed Big Boy No. 4014, the world's largest operating steam locomotive, will come west during its "Westward Bound" summer tour.

A new Union Pacific commemorative locomotive will be a new attraction for the College World Series this year.

Big Boy No. 4014 was delivered to Union Pacific in December 1941. The locomotive was retired 20 years later, having traveled 1,031,205 miles in its 20 years in service, according to Union Pacific.

Union Pacific said on Monday that it will spend $20 million testing low-emissions locomotives in California.The railroad may eventually test up to 25 locomotives with various low-emissions ...