Franz Kruckenberg
Franz Friedrich Kruckenberg was an engineer and pioneer of high speed railway systems. He designed several high speed trains. His most famous design was the Schienenzeppelin.
Kruckenberg was born into an oldestablished Hamburg merchant family. From 1904 to 1907 he studied mechanical engineering at the Technische Hochschule Charlottenburg in Berlin, graduating in naval engineering. Before World War I he designed aircraft and airships. Even then he already criticised airships because of their explosive hydrogen filling and the civil use of aircraft because of their high fuel and maintenance costs.
Source: Wikipedia