ACF Industries, originally the American Car and Foundry Company, is an American manufacturer of railroad rolling stock. One of its subsidiaries was once (1925–54) a manufacturer of motor coaches and trolley coaches under the brand names of (first) ACF and (later) ACF-Brill. Today, the company is known as ACF Industries LLC and is based in St. Charles, Missouri. It is owned by investor Carl Icahn.

The J. G. Brill Company manufactured streetcars, interurban coaches, motor buses, trolleybuses and railroad cars in the United States for nearly 90 years, hence the longest-lasting trolley and interurban manufacturer. At its height, Brill was the largest manufacturer of streetcars and interurban cars in the US and produced more streetcars, interurbans and gas-electric cars than any other manufacturer, building more than 45,000 streetcars alone.