LNER Class Y10
class of 2 four-cylinder, double-ended 0-4-0VBT locomotives built by Sentinel
The LNER Class Y10 was a class of two 0-4-0T geared steam locomotives built by Sentinel Waggon Works for the London and North Eastern Railway and introduced in 1930. The LNER numbered them 8403 and 8404 but they were later re-numbered 8186 and 8187. This was the second use of the classification Y10 by the LNER. The first was for an ex-North British Railway 0-4-0 steam tender locomotive, withdrawn 1925.
Both the Sentinels passed into British Railways ownership in 1948 but 8187 was withdrawn almost immediately. Number 8186 was allocated the BR number 68186, but never actually carried it, and was withdrawn in 1952.
Power unit
The superheated vertical water-tube boiler and the motor were similar to those used in Sentinel steam wagons. Each locomotive had two 2-cylinder engines, giving a total of 200 horsepower (150 kW). The engines had poppet valves and reversing was by sliding camshaft. The advantage of the water-tube boiler was that steam could be raised much more quickly than with a conventional fire-tube boiler.
Transmission
Final drive to the wheels was by sprocket and chain.
The public source identifies “LNER Class Y10” as class of 2 four-cylinder, double-ended 0-4-0VBT locomotives built by Sentinel. This brief keeps that definition visible, then builds a research path around LNER, Class and class.
Why this record matters
A short description can identify a subject without explaining its stakes. For “LNER Class Y10”, the useful work is to connect “class of 2 four-cylinder, double-ended 0-4-0VBT locomotives built by Sentinel” to the records capable of establishing context and consequence.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated May 13, 2026. The linked authority identifier is Q6459297. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1930, 1925, 1948 and 1952.
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 “LNER Class Y10”, its source revision and the description used here.
- Expand the search: follow LNER Class Y10 primary sources, LNER Class Y10 archive and LNER 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 “LNER Class Y10”?
- Which institution is responsible for the underlying evidence?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “LNER Class Y10” 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.