Looking through this thread, I do not see a complete set of verses.

Here is the "official" version of the Dummy Line as sung by Joe Hickerson at a house party at my parents house in Webster Groves, MO on 6/11/1976. I have the recording -- pls email me at drusher at swbell dot net if you would like to get the tune.

Notes:

1. The CB&Q railway ended up being owned by the Burlington Northern Lines. I have a rare harmony harp guitar previously owned by a old man who worked for the Burlington Northern Line. He did shows playing train songs on the harp guitar in the Chicago area. I don't know if he knew this song but I would be surprised if he didn't. I have been doing this song for 45 years with extreme stop-tempo vocals on the chorus to freak people out. I sometimes play it on the harp guitar. History of the CB&Q is
on Wikipedia . It started out in Chicago and built out from there.

2. It appears that the term "dummy line" refers a spur run (St. Louis to Memphis), not the other definitions I see above. Since this is a vaudeville-era novelty tune, and there is no reason for the train to run so slow, it appears the slowness is the gag for the humor in the verses.

3. This song was apparently quite popular. I say this because it seems that a lot of people wrote more verses for it. Joe sang one of the add-on verses on my recording.

4. The Pickard Family did a similar version with different verses that does mention St. Louis. the tune is different. You can hear it on Youtube

The Dummy Line
(as sung by Joe Hickerson)
A song about the old CB&Q railway

Some folks say that the Dummy won’t run
Let me tell you what the Dummy done done
Left St. Louie at half past one
And pulled into Memphis at the setting of the sun

Chorus:
On the Dummy Line, the Dummy Line
Rise and shine on the Dummy Dummy Line
Rise and shine and pay my fine
When you ride on the dummy, on the Dummy Dummy line.

Across the prairie in a streak of rust
Something’s moving in a cloud of dust
Pulls out of the station with a wheeze and a whine
It’s the two o’clock flyer on the Dummy Dummy line.

We left St. Louie at half-past two
Looked out at four and saw the same old view
Said to the conductor “What’cha waitin’ here for”?
Says he “We’ve been movin’ for an hour or more.

I looked out of the window , and a snail whizzed past
The conductor he said, “this train is fast”.
Says I “Old man, that may be true
But won’tcha please tell me what it’s tied fast to?”

I asked the drummer “What do you sell?”
“Brains”, said he “If I really must tell.”
Says I “Young man you’re the first example,
of a traveling man who never carries a sample.”

I said to the conductor “Won’t you speed up a bit?”
Says he “You can get off if you don’t like it.”
Said I “Old man, I’d take your dare,
But the folks don’t expect me ‘till the train gets there.”

We pulled into the station with a wheeze and a cough.
The conductor said “May I brush you off?”
Says “I don’t know you silly jade,
I prefer to descend in the usual way.”

( Note: this is an add-on verse)
There was an old lady by the name of Nan,
Tried to get a job as a good humor man
But the kids wouldn’t buy, they left her alone
They wouldn’t buy nothing from an ice cream croon.

The Lord made me, the Lord made you.
The Lord he must have made the C.B.& Q.
This must be so for the scriptures say
That “the Lord he made all the creeping things.”

Other collected verses:

I asked an old man about a hundred years old
How long he’d been working on this old railroad
He looks at me and he tells me “Son,
I was the newsboy on the train’s last run.”

I thought this journey would forever last
Train started movin’, both smooth and fast
Conductor he says, with a pat on my back,
“Well don’t be scared Joe, we just jumped the track.”