Steam Locomotive Stops in North Platte UP Steam Locomotive No. 844The Union Pacific Railroad's steam locomotive No. 844 left from North Platte on its way to Omaha Thursday morning. I can always tell with steam locomotive is in North Platte because of their distinctive whistle. A steam whistle makes such a deep rich sound. The curious public is kept back behind a six foot tall chain link fence I'm sure to protect us from that live steam. No. 844 the 4-8-4 steam locomotive is one very impressive machine. If you're interested in No. 844's vital statistics check. here