The Coal Trunk-Line (Polish: Magistrala Węglowa) is one of the most important rail connections in Poland.
It crosses the central part of the country, from the coal mines and steelworks of Upper Silesia in the South to the Baltic Sea port of Gdynia in the North. The line is used mostly by freight trains: passenger connections on it are few. Constructed in the late 1920s and early 1930s, it was one of the biggest investments of the Second Polish Republic.