The photos that show how New York City's subway was built

A demonstration for an underground transit system in New York City was first built by Alfred Ely Beach in 1869, with a 312 foot run under Broadway in Lower Manhattan (this was later demolished when the BMT Broadway Line was built in the 1910s). The first underground line of the subway opened in October of 1904, though the first elevated line opened 35 years prior.Look at the underground subway system being constructed, from Delancey Street to the Bronx, from 1901 through 1931