Maschinenbau Kiel (MaK) is a German engineering company specializing in the design and production of marine diesel engines and locomotives. It is a subsidiary of Caterpillar Inc., a global leader in the manufacturing sector. The company primarily operates in Europe but has a worldwide distribution network that includes Asia and the Americas. Founded in the 1920s, MaK has gained a reputation for delivering reliable, high-performance products that meet the stringent demands of marine and railway transport.