A historic Union Pacific Railroad steam locomotive which which is winding down a historic tour across the country chugged into Salina Thursday night. A crowd gathered at the Union Pacific Depot at 400 N 13th Street, as Big Boy No. This is the fourth time that Big Boy has stopped in Salina since 2019, when it returned to the rails. It is the world’s only operating Big Boy locomotive. Union Pacific asks anyone planning on watching the train pass through to stand at least 25 feet away from the tracks.