The Tennessee Coal, Iron and Railroad Company (1852–1952), also known as TCI and the Tennessee Company, was a major American steel manufacturer with interests in coal and iron ore mining and railroad operations. Originally based entirely within Tennessee, it relocated most of its business to Alabama in the late nineteenth century, following protests over its use of free convict labor. With a sizable real estate portfolio, the company owned several Birmingham satellite towns, including Ensley, Fairfield, Docena, Edgewater and Bayview. It also established a coal mining camp it sold to U.S. Steel which developed it into the Westfield, Alabama planned community.

Fairfield is a city in western Jefferson County, Alabama, United States. It is part of the Birmingham metropolitan area and is located southeast of Pleasant Grove. The population was 10,000 at the 2020 census.