What is the population of the town which was part of the International Railway of Maine at the 2010 census?
International Railway of Maine: The International Railway of Maine was a historic railroad constructed by the Canadian Pacific Railway (CPR) between Lac-Mégantic, Quebec and Mattawamkeag, Maine, closing a key gap in the railway's transcontinental main line to the port of Saint John, New Brunswick. Mattawamkeag, Maine:  The population was 687 at the 2010 census.
687