A short while ago, I was asked to make a chart or illustration showing the different unit placements that made up the various Boxcab locomotives on the Road. Below are screenshots of each of the EF- arrangements and their respective designations. 
Both pantographs up on helpers and/or wet or icy conditions.
Full-sized booster cut in between the cab-units.
"Bobtail" Booster cut in between the cab-units.

With any combination of 2 boosters. Can be 2 full-sized boosters as well.....Later in the 1950's, the electrics were MU'd with diesels, to add even more tractive effort.I hope this clears up any confusion and opens up more variations to users.Timtimmuir@wcn.net
Street and Interurban Electric Railway Models
Sumpter Valley B&B Gang
Willamette Valley Route
(No timetable for release)
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