The listing, Vintage Brass Union Pacific Padlock has ended.
This antique brass lock is pretty cool. It says "Union Pacific CS-21, Roadway & Bridge Department. From my research, it was used to lock various gates and railroad crossings. It uses a skeleton key, which I do not have. It also has some of the original chain that was used. I would keep it, but I am clearing out things I have collected over the years due to health issues.