The E5 was distinguished from the otherwise very similar E3, E4 and E6 by being clad in polished stainless steel to match the Burlington's Zephyr trains. It also featured unique small grill-like ornamentation on both sides of the upper headlight. Like the other pre-war models in the E-series, the E5 had a sloping “slant nose” design and was equipped with two headlights—a regular stationary headlight above a gyrating Mars signal light. The E5 was the sixth model in the EMD E-unit series.