I have "Mama, mama can't you see" on my computer at work and I will post it tomorrow. It's in the official songbook for the Canadian Nijmegen contingent.

Here's the version of the Flying Boxcar that I remember, although I know it as "Our Sergeant Major":

They took the Flying Boxcar up to 40,000 feet,
They took the Flying Boxcar up to 40,000 feet,
They took the Flying Boxcar up to 40,000 feet,
And he ain't gonna jump no more