I present you the 4-stroke diesel engine type D13 developed by Moës. This is an improvement of the D1 engine, with a larger displacement, which allows to obtain a higher power. This engine was used to power several types of locomotives, including the DL 13, which is a surface version based on a Bl locomotive, as well as the DLG13, which is a version for galleries. Moës also used this engine to manufacture normal track locomotives under the name LM13. In addition to its use in locomotives, the D13 engine has also been used in stationary applications, such as generators.