The General Motors assembly plant has begun operations again this week after a three-year closure which seemed to augur the end of the auto industry in Oshawa. But in a surprising move, the company announced it would reopen amid growing demand for GM pickup trucks. The plant created 1,800 new jobs, supporting two production shifts. Unifor, the union representing the workers, says a third will be added in the future. Trucks produced in Oshawa will start being shipped to dealers in December. The first vehicle off the line has a patriotic paint job and will be donated to a children’s charity.