My father, who grew up in Toronto and is now 85 taught me the words as:

One day, I chanced to take upon the trolley,
My tall silk hat, my tall silk hat.
I laid it gently on the seat beside me,
My tall silk hat, my tall silk hat.
A big fat lady came and sat upon it.
My tall silk hat, my tall silk hat.
A big fat lady came and sat upon it.
My tall silk hat, my tall silk hat.
Chistopher Columbus, whaddya think o that?
A big fat lady sat upon my hat.
My hat she broke, now that's no joke.
My hat she broke, now that's no joke.
Chistopher Columbus, whaddya think o that?

Just thought it was interesting..obviously the predecessor to the subway version..or at least the canadian version.