"an unnamed locomotive manufacturer based in Chicago"
You mean EMD? There aren't too many locomotive manufacturers, let alone those based in Chicago.
https://en.wikipedia.org/wiki/Electro-Motive_Diesel
"an unnamed locomotive manufacturer based in Chicago"
You mean EMD? There aren't too many locomotive manufacturers, let alone those based in Chicago.
https://en.wikipedia.org/wiki/Electro-Motive_Diesel