Extra Credit is video series that examines topics related to history in the Thunder Bay District and exploring that history.

The Kinghorn is former rail line located in northwestern Ontario which ran from the community of Longlac to the City of Thunder Bay. Constructed between 1911 and 1914 by the Canadian Northern Railway, it became part of the Canadian National Railways network in 1918. After undergoing many transformations and names changes, its final form emerged in 1960 as the Canadian National Railway Kinghorn Subdivision. Service on the line was discontinued in 2005 and this video documents my interest in its history and my attempts to document what remains of the line.