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is a borough in Delaware County, Pennsylvania, United States. The population was 1,901 at the 2000 census. The borough was named after David Trainer, a local mill owner.
According to the United States Census Bureau, the borough has a total area of 1.3 square miles (3.5 km²), of which, 1.1 square miles (2.7 km²) of it is land and 0.3 square miles (0.7 km²) of it (20.90%) is water.