Sounds like a lot of people learned this song from Silver Burdett school songbooks. Here is the complete Silver Burdett rendition:

THE DUMMY LINE

Some folks say that the Dummy don't run.
Come and let me tell you what the Dummy's done;
She left St. Louis at half past one,
And she rolled into Memphis at the setting of the sun.

CHORUS
On the Dummy, on the dummy line,
Rise and shine, Rise and shine and pay your fine,
When you're riding on the Dummy, on the Dummy Dummy line.

I got on the Dummy, didn't have my fare,
Conductor hollered, "What you doing there?"
I jumped up and made for the door,
And he cracked me in the head with a two by four.
(CHORUS)

I hopped off the Dummy and I lit on the track,
Dragged my feet and scraped my back.
I cam to life and slung my dogs,
Looked for sure like I'm on the hog.*
(CHORUS)

Some folks say that the Dummy don't run.
Come and let me tell you what the Dummy's done;
She left St. Louis at half past two,
But I walked to Memphis 'fore the Dummy came through.


*Down on one's luck

Source: Music Now and Long Ago, pp78-79 - Book Three of the Silver Burdett Music for Living series, 1956, (California edition 1958)

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Click to play

The tune in the Digital Tradition sounds like "Casey Jones" to me, as does the one from Norm Cohen's Long Steel Rail - Click to play. This one is quite different.