I posted this in another thread, but thought it would be interesting to some in this thread as well, so pardon the duplication.
We've got the South Shore Line over here that runs between South Bend, IN and Chicago. Its passenger service is all overhead wire. About 90-100 miles of track. Some more is being built currently.
Then there's the Chicago South Shore and South Bend RR. That's a freight RR. All diesel electric now, but when I was a kid, they had Little Joe's. It originally built the South Shore Line and operated it until 1990. Now they are two separate entities, but share some trackage.
en.wikipedia.org
en.wikipedia.org
en.wikipedia.org
From the article: (bold by me).
"
South Shore Line[edit]

A
South Shore Line unit in 1966
The South Shore, while primarily a commuter railroad between
Chicago,
Illinois, and northwestern
Indiana, used them in freight service.
[5] They were modified to operate on 1500 V DC catenary, and were delivered with roller bearings on all axles as on the Milwaukee EP-4s. In service on the South Shore the "Little Joe" name was not generally used; they were called "800s".
Two of the three lasted until 1983, making them the last electrics in regular mainline freight service on a US common-carrier railroad. Today, freight trains are pulled by diesel-electric locomotives.
Two 800s survive today, 802 at the
Lake Shore Railroad Museum, and 803 in running condition at the
Illinois Railway Museum.
[6]"