John B. McDonald
American contractor

John B. McDonald (November 7, 1844 – March 17, 1911) was an Irish-born contractor who is best known for overseeing construction of New York City's first subway line from 1900 to 1904.
Early life
John B. McDonald was born on November 7, 1844, in Cork, Ireland to Bartholomew McDonald, a contractor and cellar digger. At a young age, he came to New York City and attended public schools. His father became served as a representative in the New York City Board of Aldermen.
Career
From 1900 to 1904, McDonald oversaw the construction of the first New York City Subway line. McDonald won the job with a $35 million bid in 1900, but he did not have the capital necessary to post the surety bonds the city required, so he turned to the banker August Belmont Jr., for financial backing. After that, McDonald effectively worked for the company that Belmont formed, the Interborough Rapid Transit Company, but McDonald was credited with being an extremely able builder. The initial segment from City Hall to Grand Central, across 42nd Street to Times Square, and up Broadway to 145th Street—was completed on schedule on October 27, 1904. It was a remarkable achievement given the complexity and novelty of the project and periodic labor turmoil.
In 1905, McDonald was hired away by a rival transit mogul, Thomas Fortune Ryan, who proposed to build a competing subway line.
The public source identifies “John B. McDonald” as american contractor. This brief keeps that definition visible, then builds a research path around John, McDonald and American.
Why this record matters
A short description can identify a subject without explaining its stakes. For “John B. McDonald”, the useful work is to connect “american contractor” to the records capable of establishing context and consequence.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Aug 23, 2026. The linked authority identifier is Q67905719. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1844, 1911, 1900 and 1904.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. 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 “John B. McDonald”, its source revision and the description used here.
- Expand the search: follow John B. McDonald primary sources, John B. McDonald archive and John 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 “John B. McDonald”?
- What terminology or title could unlock a more precise catalogue search?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “John B. McDonald” 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.