I am considering correcting the name of the railroad going from Bowie to Globe, AZ. It is named Arizona Eastern Railway, but on OpenStreetMap it is identified as Union Pacific. The railroad has had a number of names since it was built, so I'm trying to figure out what to put under the old_name tag. Looking at Wikipedia entries for Gila Valley, Globe and Northern Railway, Arizona Eastern Railway and Southern Pacific Railroad, I've come up with these values:
old_name:1885-1898=Gila Valley, Globe and Northern Railway
old_name:1899-1923=Arizona Eastern Railroad
old_name:1924-1987=Southern Pacific Railroad
I do remember seeing some Union Pacific locomotives, but the Wikipedia entry for Arizona Eastern Railway says that the line was sold to Kyle in 1988, and Southern Pacific was sold to Union Pacific in 1998. I think this shows that the railroad was never part of UP.
Are my old_name entries a reasonably correct improvement to OpenStreetMap?
The line from Lordsburg, NM to Clifton, AZ is also part of Arizona Eastern Railway, now, but it has a different history.