 Combined with the eight cars in the test group, that would give Metro 64 new cars, meaning eight 7000-series trains of eight cars each would be in service next summer.After that, 300 more cars would arrive by February 2017, followed by an additional 100, for a total of 528 new cars at an overall cost of $1.46 billion.Metro warned its funding partners – VA, MD and DC – that its option to purchase an additional 220 7000-series cars expired in June 2015 and required a funding commitment of $614 million for rolling stock, and $856 million for related infrastructure upgrades.