 Mass transportation throughout the Denver metropolitan area is managed and coordinated by the Regional Transportation District ( RTD ) . RTD currently operates more than 1 @,@ 000 buses serving over 10 @,@ 000 bus stops in 38 municipal jurisdictions in eight counties around the Denver and Boulder metropolitan areas . Additionally , RTD operates seven rail lines , the A , C , D , E , F , W , and H with a total of 57 @.@ 9 miles ( 93 @.@ 2 km ) of track , serving 44 stations . All lines are light rail except the A , a commuter rail line . <unk> is a light rail / bus / rail expansion project approved by voters in 2004 which will serve neighboring suburbs and communities . The W line , or West line , opened in April 2013 serving Golden / Federal Center . 
