The MBTA’s subway system returned to full service Thursday, officials said, after working for nearly two months to get all of its cars back on the tracks following a series of severe winter storms. Joe Pesaturo, a spokesman for the transit agency, said the Green Line was the last to return to normal. There were 146 Green Line cars running Thursday, which means the MBTA’s rapid transit system has “the required numbers of cars in service” for the first time since Jan. 22. He said the Red Line now has 178 cars working, the Orange Line has 96, and the Blue Line 84. The service calculations released by Pesaturo do not include the commuter rail, which continues to operate under reduced schedules but hopes for full restoration by the end of this month.Andy Rosen can be reached at firstname.lastname@example.org. Follow him on Twitter at @andyrosen. Nicole Dungca can be reached at email@example.com.