G.M. General Motors agreed this weekend to return parts-making equipment to one of its striking factories, in a gesture the UAW called an "extremely positive move." Meanwhile, the strikes have shut down 27 of 29 of the company's assembly plants. The latest factory to be idled is a truck plant in Oshawa, Ontario. It's a plant GM had hoped to keep going because it had just started building a truck that's been called the automaker's single most important new product in a decade. NPR's Don Gonyea reports.