Good Friday
I picked up this Rock Island Lines Cross Peen (I believe) Hammer today.
Just curious if it is associated with the rail road or if they also made tools under the name... and anything else I can learn

Regards!
BuddyC
IMG_5181 by William Clark, on Flickr

How do you know it is Rock Island?

It is marked Rock Island Lines

Maybe property of their blacksmith's or repair shop?

They usually marked things "CRI&PRR"
Curious.
I don't see the markings in the photo.

By looking at the photo on Flickr and enlarging it, I can see markings, but can't decipher them. Do you have any photos of only the head ?

Do now

00000PORTRAIT_00000_BURST20180818150500217 by William Clark, on Flickr

Well I don't know.
Looks like a commercial made head.
(Many railroads made their own wrenches and other tools 'back in the day'.)
And,...the marking is curious.
Looks like you got a mystery on your hands.
Good luck.

Many tool makers did batch runs for larger companies and would put their company name on the tools as part of the deal.This is a Ford script hammer most likely from the 1920-30's for the H.F. Trade School, made by Heller

I like a mystery

thanks