Koiwai Station
railway station in Takizawa, Iwate Prefecture, Japan
Koiwai Station (小岩井駅, Koiwai-eki) is an East Japan Railway Company (JR East) railway station located in the city of Takizawa, Iwate Prefecture, Japan.
Lines
Koiwai Station is served by the Tazawako Line, and is located 10.5 km from the terminus of the line at Morioka Station.
Station layout
Koiwai Station has a two opposed side platforms, connected to the wooden station building by a footbridge. The station is unstaffed.
Platforms
History
Koiwai Station opened on June 25, 1921. The station was absorbed into the JR East network upon the privatization of the JNR on April 1, 1987.
Passenger statistics
In fiscal 2015, the station was used by an average of 496 passengers daily (boarding passengers only).
Begin with the source’s own compact description: “Koiwai Station” is railway station in Takizawa, Iwate Prefecture, Japan. The dossier treats that line as a proposition to test through Koiwai, Station and railway, not as a finished interpretation.
Why this record matters
The phrase “railway station in Takizawa, Iwate Prefecture, Japan” 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.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Aug 25, 2026. The linked authority identifier is Q6426387. Authority coordinates are 39.710, 141.025. 1 of 3 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1921, 1987 and 2015.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. 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
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Koiwai Station”, its source revision and the description used here.
- Expand the search: follow Koiwai Station primary sources, Koiwai Station archive and Koiwai 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 “Koiwai Station”?
- What physical evidence or contemporary plan supports the description?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Koiwai Station” 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.