EMD E9
model of 2400 hp American passenger cab locomotive
The E9 is a 2,400-horsepower (1,790 kW), A1A-A1A passenger train-hauling diesel locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois, between April 1954 and January 1964. 100 cab-equipped A units were produced and 44 cabless booster B units, all for service in the United States. The E9 was the tenth and last model of EMD E-unit and differed from the earlier E8 as built only by the newer engines and a different, flusher-fitting mounting for the headlight glass, the latter being the only visible difference. Since some E8s were fitted with this, it is not a reliable way to distinguish the two. The E9 has two 1,200 hp (895 kW), V12 model 567C engines, each engine driving one generator to power two traction motors.
Engine and powertrain
The E9 uses twin 12 cylinder 567C engines developing a total of 2,400 hp (1,800 kW) at 800 rpm. Designed specifically for railroad locomotives, this Roots-blown, mechanically aspirated 2-stroke 45-degree V-type, with an 8+1⁄2 by 10 in (216 by 254 mm), bore by stroke, giving 567 cubic inches (9.29 L) displacement per cylinder, remained in production until 1966. Two DC generators, one per engine, provide power to four motors, two on each truck, in an A1A-A1A arrangement. This truck design was used on all E units and on MP 7100 and CB&Q 9908 power cars. EMD has built all of its major components since 1939.
Begin with the source’s own compact description: “EMD E9” is model of 2400 hp American passenger cab locomotive. The dossier treats that line as a proposition to test through model, American and passenger, not as a finished interpretation.
Why this record matters
The phrase “model of 2400 hp American passenger cab locomotive” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 10, 2026. The linked authority identifier is Q5323405. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1954, 1964, 1966 and 1939.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “EMD E9”, its source revision and the description used here.
- Expand the search: follow EMD E9 primary sources, EMD E9 archive and model research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “EMD E9”?
- Which institution is responsible for the underlying evidence?
- Which cited source is closest to the event, object or claim?
Search terms from this dossier
This entry incorporates text from “EMD E9” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.