817 series
Japanese electric multiple unit train type

The 817 series (817系) is an AC electric multiple unit (EMU) train type operated on commuter and local services by Kyushu Railway Company (JR Kyushu) in Japan since 2001. The design was based on the earlier 815 series, with transverse seating replacing the previous longitudinal seating, although later variants reverted to longitudinal seating.
Variants
There are five sub-series variants, 817-0, 817-1000, 817-1100, 817-2000, and 817-3000 series, allocated to five depots, Kagoshima, Kumamoto, Minami-Fukuoka, Nagasaki, and Nōgata. The trains carry large colour-coded stickers next to the passenger doors according to the depot.
Kagoshima (817-0 series): Blue
Kumamoto (817-0 series): Green
Minami-Fukuoka (817-3000 series): Orange
Nagasaki (817-0 series): Red
Nōgata (817-1000, 817-1100, 817-2000 series): Yellow
817-0/-500 series
31 two-car sets (V001 to V031) were delivered to Minami-Fukuoka and Nōgata depots between August September 2001 for use on the newly electrified Fukuhoku Yutaka Line, Nagasaki Main Line, and Sasebo Line.
The 31 sets were later reallocated to Kagoshima, Kumamoto, and Nagasaki depots from 2003 following the arrival of 817-1000 series sets.
In fiscal 2020, set V004's transverse seating was replaced with longitudinal seating. It was given the classification 817-500 series and renumbered V504.
Formation
The KuMoHa 817 car is fitted with a PS401K single-arm pantograph.
Interior
Seating is arranged in a transverse configuration, with flip-over seat backs to face the direction of travel.
Begin with the source’s own compact description: “817 series” is japanese electric multiple unit train type. The dossier treats that line as a proposition to test through series, Japanese and electric, not as a finished interpretation.
Why this record matters
The phrase “japanese electric multiple unit train type” 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.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Feb 13, 2026. The linked authority identifier is Q4644521. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2001, 1000, 1100 and 2000.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. 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 “817 series”, its source revision and the description used here.
- Expand the search: follow 817 series primary sources, 817 series archive and series 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 “817 series”?
- 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 “817 series” 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.