I have 4 sets of bank notes drawn on the baltimore & ohio railroad
company dated may 1, 1940 and 41, they have a picture of a woman on
the front, a big letter "S" and serial nos. Do they have any value or
collectibility? Pat

Greetings Pat,
Your terminology is a little confusing.  Technically, a "bank note" is
issued by a bank and is a form of money.  Some stock certificates of
the B & O were printed by the American Bank Note Co., whose name would
appear in small type at the bottom.

If you could post a link to a website where you have loaded a picture
of one, that would help greatly.
If you can't do that, could you describe the items (one of them if
they are all similar):  dimensions, the first few lines of text, name
and title of the person(s) who signed the item.

Just a warning: the email notification system is not functioning.  You
will have to check yourself if anything posted to your question.

Regards, Myoarin   (This is just a free comment, not an "answer".)