Editing North Braddock, Pennsylvania (section)

===Coal and steel===
In 1835 the first [[coal mine]] opened between the hills near Sixth Street. During the 19th century the railroad industry was expanding across the country. [[Andrew Carnegie]], with the increasing demands in steel for the railroad, began to build his first [[steel mill]] in 1872, named for [[John Edgar Thomson]], the president of the [[Pennsylvania Railroad]]. By 1873 the demand for steel for the railroad had decreased, and the construction of the mill was halted. Good news came though when Carnegie secured a $2 million loan and finished the steel mill to roll its first steel under the supervision of superintendent William R. Jones. The mill would go on to expand, and in 1880 the first [[blast furnace]] was used at the [[Edgar Thomson Steel Works]].{{citation needed|date=November 2022}}