Promontory Point, Utah, May 10, 1869.
The "almost" refers to the absence of a Missouri River bridge at Council Bluffs, that came a few years later. Four years after the end of the Southern Rebellion . . . DONE.
Happy 149th to the Transcon and let the stack trains roll.
For the sesquicentennial, Union Pacific (which now includes Central Pacific) plan to roll out Big Boy 4014.