The phrase "parallel tracks" means two separate paths or activities that are happening at the same time, but are not connected or affecting each other. Full definition
Until then, the two stories run on parallel tracks but in dramatically different ways. (thewrap.com)
But they were all his and all ran together, on parallel tracks for most his life. (davidzwirner.com)
Several parallel tracks of discussions are under way, some sponsored by Washington think tanks, including the Brookings Institution and Resources for the Future. (heatisonline.org)