EMD E7

{{Short description|American passenger cab diesel locomotive}}

{{no footnotes|date=July 2016}}

{{Infobox locomotive

| name = EMD E7

| powertype = Diesel-electric

| image = RR76.37 No. 5901 Front Side.jpg

| caption = Pennsylvania Railroad E7A #5901 on display at the Railroad Museum of Pennsylvania in 2015.

| builder = General Motors Electro-Motive Division (EMD)

| buildmodel = E7

| builddate = February 1945 – April 1949

| totalproduction = 428 A units, 82 B units

| aarwheels = A1A-A1A

| gauge = {{track gauge|ussg}}

| wheeldiameter = {{convert|36|in|0|abbr=on}}

| minimumcurve = 21° ({{convert|274.37|ft|m|2|abbr=on|disp=or}} radius)

| length = {{convert|71|ft|abbr=on}}

| width = {{convert|10|ft|6+1/2|in|abbr=on}}

| height = {{convert|14|ft|11|in|abbr=on}}

| locoweight = A unit: {{convert|315000|lb|abbr=on}}, B unit: {{convert|290000|lb|abbr=on}}

| fueltype = Diesel

| primemover = (2) EMD 12-567A

| rpmrange = 800

| enginetype = V12 Two-stroke diesel

| aspiration = Mechanical via Roots blower

| displacement = {{convert|6804|cuin|L|abbr=on}} each

| generator = (2) EMD D-4

| tractionmotors = (4) GM D7 or D17 or D27

| cylindercount = (2) 12

| maxspeed = {{convert|85-117|mph|kph|0|abbr=on}}

| poweroutput = {{convert|2000|hp|0|abbr=on|lk=on}} total

| tractiveeffort = {{convert|56500|lbf|abbr=on}} starting, {{convert|31000|lbf|abbr=on}} continuous

| locale = United States

| disposition = One preserved on static display, remainder scrapped.

}}

The E7 was a {{convert|2000|hp|sing=on}}, A1A-A1A passenger train locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois. 428 cab versions, or E7As, were built from February 1945 to April 1949; 82 booster E7Bs were built from March 1945 to July 1948. (Circa 1953 one more E7A was built by the Los Angeles General Shops of the Southern Pacific by rebuilding an E2A.) The 2,000 hp came from two 12 cylinder model 567A engines. Each engine drove its own electrical generator to power the two traction motors on one truck. The E7 was the eighth model in a line of passenger diesels of similar design known as EMD E-units, and it became the best selling E model upon its introduction.{{cite book |last1=Foster |first1=Gerald L. |title=A field guide to trains of North America |date=1996 |publisher=Houghton Mifflin |location=Boston |isbn=0-395-70112-0 |page=100}}

In profile the front of the nose of an E7A was less slanted than on earlier EMD passenger locomotives, and the E7, E8, and E9 units have been nicknamed “bulldog nose” units. Some earlier units were called “shovel nose” units or “slant nose” units.