You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when were the subways built in new york city?" whose answer is October 27, 1904.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when were the subways built in new york city
Useful Output:

Doc 1: While Oct. 27, 1904, marked the opening of the initial operating segment of the subway line, the remainder opened in May of 1908.
Doc 2: Construction of the New York City Subway took 4 years and was completed in 1904; or the first section of the subway was completed then, at least
Doc 3: In October 1904, New York City's first underground subway opened, The New York Times reported. A black and white photo of the first underground
Doc 4: Since December 16, 1940, New York has not opened another new subway line, aside from a handful of small extensions and connections.
Doc 5: However, when the subway opened on October 27, 1904, it quickly became the travel system of choice for New Yorkers and effectively sped up New