My mother sang it to me in the late '30s and '40s in New Jersey with some variations from the versions above::

From six months of fishing, off the coast of Maine,
From the town of Bangor, came a Pullman train.
Whiskers all extended, small mustache as well,
Oh see that Harvard student. Say, doesn't he look swell.

Seated at the window, no one at his side,
Through an Eastern village the Pullman train did ride,
Enter aged couple. Take the hindmost seat,
Enter pretty maiden, so (bashful)? and petite.

Bashfully(?) she falters, "Is this seat engaged?"
They see the aged couple, so happily arranged.
.........

Here I run out of words. They go through the tunnel but I cannot remember anymore words until the last line:

But doesn't that tiny hairpin in his mustache just look swell?

Was hoping to find the words to fill in my blanks, but none of the versions cited match the way I remember my mother singing it.