Obsolete term for an ironworks or iron factory. Modern Japanese uses 鉄工所 (てっこうじょ) instead.
See also: 鉄工所
鉄工廠 was once used as a word for an ironworks.
Compound of 鉄 (てつ, iron), 工 (こう, work), and 廠 (しょう, factory). The kanji 廠 is now rare in modern Japanese.