My dad remembers seeing the old GEs as a kid (U30s, U33s, and so on) and he called the "lug-lugs" because of their distinctive exhaust note. At the time he didn't know what they were other than they sounded vastly different than the first gen EMD units he saw more frequently.
Somewhere with wooded hills and small mountains. Eastern US, someplace like Pittsburgh, Pa, but could be a lot of places with hills east of the Mississippi.