Union Pacific’s Big Boy locomotive in Houston Tuesday on its 10-state tour

HOUSTON – Big Boy No. 4014, a Union Pacific steam locomotive built in the 1940s to conquer mountains while carrying equipment in support of World War II, is embarking on a 10-state tour and is on public display Tuesday in Houston with free admission.

On Tuesday, people will get a chance to talk to the steam crew, tour the “Experience the Union Pacific” rail car — a railroad museum on wheels — and take a “selfie” with the world’s largest steam locomotive, one of 25 of its kind built and the only one still in operation, according to a news