Here's another version. Lyrics transcribed from the sound file at The Record Lady's All-Time Country Favorites, Requests Page 7.

THE FIREMAN COWBOY
[Rex Allen and Slim Pickens]
(As sung by Rex Allen)

The westbound train was speedin', speedin' toward its goal.
The engineer was ahead of it while the fireman shoveled coal.
Now the fireman had been a cowboy, an' he was a cowboy yet,
And to prove that he still was a westerner, he kept his lariat.

Now as that train went speedin' across the desert so wild,
Right down the track ahead of them, there strolled a little child.
Her golden hair in ringlets was a-streamin' down her back,
An' she little knew the danger as she strolled along that track.

[THIS VERSE SPOKEN:]
"My God!" the engineer shouted, as he throwed on all of his brakes.
"I'd stop this engine if I could, but I—I just ain't got what it takes."
And then our fireman cowboy, with his lariat so true,
He climbed right out on that ol' runnin' board, an' said, "I'll see what I can do."

Well, he crawled out onto the boiler as the train sped on its course,
An' he swung his trusty lariat just like he rode a horse.
He latched it onto a telegraph pole an' dallied on the big smokestack,
An' before you knowed what had happened, that train was jerked right off the track.

Well, it plowed into a sandbank. Oh, it caused a terrible wreck.
They found our fireman cowboy with the engine on his neck.
Well, they buried our fireman cowboy where the desert winds blow wild.
He killed two hundred passengers. Thank God, he saved the child.

[Recorded as a narration by Slim Pickens in 1977. Rex Allen's recording appears on "Voice of the West," Bear Family CD 15284, 1994; and on "The Arizona Cowboy," 2001.]

Rex Allen: https://www.youtube.com/watch?v=Ujoyeooh0_o