An Oshawa General Motors worker arrives for his shift. After rounds of layoffs, GM is now planning to add a second shift at the site before the end of 2010.

General Motors says it plans to add a second shift at its Oshawa, Ont., assembly plant before the end of the year.

The company was already planning an expansion to ramp up for production of its new Buick Regal model in early 2011, but on Thursday confirmed those plans have been moved up, possibly as early as during the fourth quarter of 2010.

General Motors of Canada says the addition of the second shift is expected to return up to 700 employees to the Oshawa plant.

The 2011 Regal is a midsize sport sedan based on the Opel Insignia, the 2009 European Car of the Year.

The new Buick Regal joins the Chevrolet Equinox and the GMC Terrain as the third new vehicle in the production commitment that was part of the company's bailout agreement with the Canadian and Ontario governments.

With files from CBC News