English: This image shows a steam locomotive on the Blairton Extension of the Cobourg & Peterborough Railway circa 1870. The original railway had gone bankrupt, but was reorganized as the Cobourg, Peterborough & Marmora Railway & Mining Company in August 1866 to serve the mining areas in the Marmora region. A new section of line was run from the Trent River to the Blairton Mine, which was the largest iron mine in North America at that time. Ore was shipped over the Extension to the Trent River where it was unloaded onto barges, toed to Rice Lake, and then loaded back onto trains on the original Cobourg and Peterborough for the trip to Cobourg Harbour. The mine closed in 1883, and the company attempted to sell off the Extension to the Ontario and Quebec Railway, but this never happened and the line was abandoned.