American Car and Foundry Company
ACF Industries, originally the American Car and Foundry Company (abbreviated as ACF), was 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.
Source: Wikipedia — American Car and Foundry Company (CC BY-SA 4.0)