The Metro Red and Purple Lines are the two entirely underground (except for the train yard beyond Union Station) heavy rail subway lines in Los Angeles and run with trains that can be up to six cars long. It is the Continental United State's newest Subway Line (Train Urbano in San Juan, Puerto Rico opened in 2004) with the first five stations of the Red Line opening on January 30, 1993. The Purple Line named initially the Red Line reached its full length to Wilshire/Western in 1996. In 1999 the first portion of the red line's extension opened and in 2000 it reached North Hollywood, and the systems present day length of 17.5 miles and 16 stations. The Red Line ran with two branch service until the Wilshire/Western Branch was renamed the Purple Line in 2006, most of the station's signage still refers the entire line as just the red line. Stations are designed to accommodate a maximum of six Breda Construzioni Ferroviare A650 cars and most daytime Red Line trains are this length, with two car trains running during the evening period. The much less heavily ridden Purple Line uses two car trains at all times except rush hours when four cars are used.