Union Pacific celebrates its sesquicentennial. There's a steam train touring the railroad's historic territory (not including North Western and Missouri Pacific and the other lines that have subsequently become part of the system).
May 10 is significant to the carrier's history, as on that day in 1869, the last spikes were driven.
Happy 143d to the Transcon, and let the stack trains roll. (And the coal. And the corn. And the pigs. And the ethanol.)