Rome Metro Line B was the first of Rome's two subway lines to open. The initial section, from Termini to Laurentina, opened in 1955. In 1990, the line was extended to the northeast, to Rebibbia. As of 2015, Line B has 26 stations along 14.7 miles of track, including the recently opened branch to Jonio. Line B is served by Breda built MB100 Stock; the stock was starting to undergo a rebuilding program as of 2008. In 2010, new stock, similar to the stock used on Line A, was delivered.