Styling
The EA and E1 had sloping noses with recessed headlights, while the E2 had a more bulbous "bulldog" nose. Models E3 through E6 had a sloping nose but with a protruding headlight, while models E7 through E9 used a less sloped (closer to vertical) style like the freight F-units. A patent of 1937 signed by several EMC engineers defined the styling.
Many older E-units were updated to newer styles. The E8 introduced the one-piece stamped Farr stainless-steel side grilles that made a continuous band from front to rear just below the roof, but these were often retrofitted to earlier units. Side windows were half-rounded on the EA/EB, square on the E1, round on the E2, square on most E3 through E7 units, and rounded portholes again on the E8 and E9, but again many railroads updated older locomotives.
The E5 units were unique, produced for the Chicago, Burlington and Quincy Railroad in all stainless steel with fluted lower carbody sides, to match the railroad's Zephyr passenger trains.
Read more about this topic: EMD E-unit
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