Trail, city, southeastern British Columbia, Canada. It lies along the Columbia River at the mouth of Trail Creek, adjacent to Rossland, in the Selkirk Mountains, and just north of the U.S.-Canada border and the state of Washington. The modern city’s economy rests on the mining and smelting of metals (especially silver, zinc, and lead) and on the production of chemicals and fertilizers, with food processing and sawmilling important as secondary industries. Trail’s mining operation eventually evolved into the Consolidated Mining and Smelting Company of Canada, Ltd. (Cominco). Inc. city, 1910. Pop. (2006) 7,237; (2011) 7,681.