I did find several references to this song which I'm guessing someone in your organization has cleverly (perhaps TOO cleverly) re-purposed:

Conductor, when you receive a fare,
Punch in the presence of the passenjare!
A blue trip slip for an eight-cent fare,
A buff trip slip for a six-cent fare,
A pink trip slip for a three-cent fare,
Punch in the presence of the passenjare!

CHORUS

Punch, brothers! punch with care!
Punch in the presence of the passenjare!