If you really want to go off the grid, the Chicago, South Shore and South Bend was electric, hauled lots of freight, and was/is only 80 miles long.
That brings the CRANDIC to mind, the second under-wires railroad I'd discovered after the Pacific Electric. -- "Not only is it not right, it's not even wrong!" From Wolfgang Pauli, perpetrator of the Pauli Exclusion Principle
