Tesla executives - including Elon Musk - walk away from newly purchased NUMMI plant with Roadster in foreground

Two months ago, Tesla hired Chris Porritt to be the vice president of its vehicle engineering program. Tesla's purchase last week of a 35-acre parcel abutting its factory in Fremont, California will give Porritt, formerly the boss of Aston Martin's Vehicle Engineering team (he's the father of the One-77 supercar), at least a portion of a test track where he can challenge and hone the EVs of the future.

The land was part of a parcel of more than 160 acres that had been owned by the New United Motor Manufacturing, Inc., the former joint venture factory built by General Motors and Toyota. When NUMMI (shown above) closed, the land was bought by Union Pacific Railroad, which sold the lot to Tesla.

While Tesla hasn't laid out its plans, we're guessing they'll eventually expand the track as the factory footprint grows; CEO Elon Musk has said Model S production could equal 800 cars per week by the end of next year. As for Porritt, from his new base in Fremont and with that new test track, he'll oversee further development of the Model S and the birth of the Model X, Roadster successor and the "affordable Tesla" due by 2017.