Compared with other passenger locomotives made by EMD before and after these models, the noses of the E3, E4, and E6 cab units had pronounced slants when viewed from the side. Therefore, these three models have been nicknamed “slant nose” units. Some units made before these models were called “shovel nose” units because of their appearance. Some units made during and after these models were called “bulldog nose” units, because of their appearance.
At least two E6s survive today. One was operated by the Midland Railway, in Baldwin City, Kansas but has since been sold and may become part of a future museum in Manly, Iowa or possibly be restored to operation. It is ex-Chicago, Rock Island & Pacific Railroad E6A #630.
Another E6 is located at the Kentucky Railway Museum, in New Haven, Kentucky. It is ex-Louisville and Nashville E6A #770. This unit is for display only, as it came to the museum without a majority of its internal parts.
| Road numbers|
| Road numbers|
|Electro-Motive Division (demonstrator)|| || || || ||to Seaboard Air Line 3014|
|Atlantic Coast Line Railroad|| || || || |
|Atchison, Topeka and Santa Fe Railway|| || || || |
|Baltimore and Ohio Railroad|| || || || |
|Chicago and North Western Railway|| || || || |
|Chicago, Rock Island and Pacific Railroad|| || || || |
|Florida East Coast Railway|| || || || |
|Illinois Central Railroad|| || || || |
|Kansas City Southern Railway|| || || || |
|Louisville and Nashville Railroad|| || || || |
|Milwaukee Road|| || || || |
|Missouri Pacific Railroad|| || || || |
|Seaboard Air Line Railroad|| || || || |
|Southern Railway|| || || |
|Union Pacific Railroad|| || || || |
|UP-C&NW joint City of Los Angeles|| || || || |
|UP-SP-C&NW joint City of San Francisco|| || || || |