Good evening from Germany to the forum,
it´s right: Tognum is a German company, formally known as "MTU" (Maschinen- und Turbinen-Union / engines and turbine union), when it had been an officially subsidiary of Daimler-Benz. Now, it has been sold to swedish "EQT" group and named "Tognum GmbH". The brand MTU will stay.
Note: GmbH means "Gesellschaft mit beschraenkter Haftung" / "private limited company"
MTU Diesel engines are well-known in Europe and many parts of the world. It´s a big manufacturer with high quality. In MTU, former engine models of "Mercedes-Benz", "MAN" (Maschinenfabrik Augsburg-Nuernberg / engine works Augsburg-Nuremberg) and "Maybach" had been brought together. They are used in ships, railroad vehicles and electric generators.
In Germany, MTU engines are built-in in almost every diesel locomotive class, i.e. 211,212,216,215,217,218,290-295. The engines have been made in the 50ies, 60ies and 70ies and are still running today. The latest models like "Bombardier TRAXX P160DE" or "SIEMENS ER20" use the 4000 series engine, and re-motorized switchers of German Railroad DB are using them too.
However, MTU is not new to me, but I´m strained how the engines do their job in America