What is form 637?

Anyone who has spent time browsing around this site knows that I am also a philatelist (*ahem*, a stamp collector).  Earlier today I was at Tosapex, an annual stamp show held in West Allis, Wisconsin.  Compared to the model train shows I attend, this show was exceptionally small and quiet, but there was plenty of railroadiana available there, especially in the form of RPO covers and stamps that depict railroad subjects.

I was at this show to find more material for my March 4 collection (which I've blogged about separately), but while I was poking through one box of post cards, I found this one...

Illinois Central Gulf RR post card

The other side of the card looks like this:

Illinois Central Gulf RR post card

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