Here's what ol' Tex has. It sounds like a fragment of a longer song, but he tells the story of Pony Bob Haslam delivering the news of Abraham Lincoln's election from Fort Kearney, Nebraska to California.
Along the way Bob's attacked by Indians, and has to defend himself and his gallant pony. Typical Western movie stuff.
It starts with a verse, goes into the story an finishes with a verse.

They rode by night, and they rode by day,
The job was hard but they found a way,
The Pony Express, they carried the mail.


Story:

Through the rain and the snow and the hail,
They never did stop and they never did fail,
The Pony express, they carried the mail.