Hello! Is this a railroad related tool?
 

Hello! A friend of mine's Grandpa passed away recently. They found this tool in his shop. No one knows what it is.

It appears to measure the lenght of something from about 54/64" to about 60/64". The silver knob-like thing appears to be for calibration, and is marked as being 58/64".

Some of the family think it may have come from the railroad, both grampa and great grampa worked for the railroad. Anybody know what this thing is for?

http://i43.photobucket.com/albums/e3...l/IMG_3759.jpg

http://i43.photobucket.com/albums/e3...l/IMG_3767.jpg

http://i43.photobucket.com/albums/e3...l/IMG_3771.jpg

http://i43.photobucket.com/albums/e3...l/IMG_3773.jpg

I don't recognise the tool but the handle looks relatively modern so I don't think it be much more than 20 years old or it could be a new handle on an old tool.