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The Grand Junction Railway (GJR) was a short-line railway in Ontario, Canada. It ran between Peterborough and Belleville. It was originally designed to be a loop, starting near Toronto and running northeast to Peterborough, then southeast to meet the Grand Trunk Railway (GTR) on the banks of Lake Ontario. By the time it had been built other lines had run into Toronto, so the GJR instead ran from Belleville to Peterborough, and then to Omemee where it met the Midland Railway of Canada. Just north of its starting point, the wholly owned subsidiary Belleville and North Hastings Railway branched off for the mining areas around Madoc, meeting the Central Ontario Railway just outside Eldorado.