It’s as improbable as it is thoroughly American. From the Pacific to the Atlantic, people of all ages are cheering for an 85-year-old relic rumbling through their communities, carrying with it both a storied past and a hint of the nation’s future. It’s Union Pacific Big Boy No. 4014’s near-miraculous resurrection from museum relic to rolling reminder of the golden age of steam, currently touring the United States as part of the America250 celebration.