EMC E4

{{No footnotes|date=August 2013}}

{{Infobox locomotive

| name=EMC E4

| powertype=Diesel-electric

| gauge={{track gauge|ussg}}

| image=Arrival of the Orange Blossom Special train- Plant City, Florida.jpg

| caption=SAL #3003 leads the Orange Blossom Special into Plant City, Florida, in December 1938, inaugurating diesel service in the Southeast.

| poweroutput={{convert|2000|hp|abbr=on|lk=in}}

| aarwheels=A1A-A1A

| buildmodel=E4

| builder=Electro-Motive Corporation (EMC)

| operator=Seaboard Air Line

| builddate=1938 – 1940

| totalproduction=14 A units, 5 B units

| primemover=EMC 12-567, 2 off

| enginetype=V12 Two stroke diesel × 2

| cylindercount= 12 × 2

| disposition=All scrapped

}}

The EMC E4 was a {{convert|2000|hp}}, A1A-A1A passenger train-hauling diesel locomotive built by the Electro-Motive Corporation of La Grange, Illinois. All were built for the Seaboard Air Line Railway. The E4 was the fifth model in a long line of passenger diesels of similar design known as EMD E-units.

The {{convert|2000|hp|abbr=on}} was achieved with two EMC model 567 V12 engines developing {{convert|1,000|hp|abbr=on}}, each engine driving its own electrical generator to power the traction motors.

The front noses of the EA, E1A, E3A, E4A, E5A, and E6A cab units had a pronounced slant when viewed from the side. Therefore, these six models have been nicknamed "slant nose" units. Later E-unit models received the same blunted "bulldog nose" as the F-units.

Ironically, the E4 was produced before the E3. Both models were identical, save for the E4 having a pneumatically-operated nose door passageway in order to facilitate crew movement between units in a locomotive consist.

All the E4s were retired and scrapped by 1964.