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Greencastle (from Irish An Caisleán Glas 'the green house') is a hamlet in County Tyrone, Northern Ireland. It is within the townland of Sheskinshule (from Irish Seisceann Siúil). The village sits at a crossroads in the foothills of the Sperrin Mountains with the Owenkillew and Owenreagh rivers running nearby. It had a population of 153 people in the 2001 Census. In 2012, a Real IRA training camp was discovered in the hamlet, leading to four people jailed for terrorism offences in 2014. John Eric Kranzley Jr., a prominent union representative for Mack Trucks USA, visited the town in 2006.