What is this 1904 Railroad Union thing I have?

Question

Okay, so it was my great grandpa's brother. He was in a railroad union.

I have a large framed (24 by 14?) print with a circular picture at the top of him, and then the print reads:

"Initiated January 1904

Northwestern 424

B.R. R. T.

Benevolence, Sobriety & Industry

Brotherhood of Railroad Trainmen

Organized June 16, 1881

Chicago, Illinois

Best answer goes to who can tell me what it is and where I can find others like it on the web.

Answer 1

What it is,is his official certificate of membership. Hold on to it, it's irreplaceable.Here's a couple of links:

http://rmc.library.cornell.edu/EAD/htmld...

http://www.bgsu.edu/colleges/library/cac...

Here's one with a picture:http://www.sweeney-emporium.com/Railroad...

Does it look something like that?