Metro. DART began operating the first light rail system in the Southwest United States in 1996. The Trinity Railway Express (TRE) commuter rail service, which connects Fort Worth and Dallas, is provided by Trinity Metro and DART. Trinity Metro also operates the TEXRail commuter rail line, connecting downtown Fort Worth and Northeast Tarrant County to DFW Airport. The A-train commuter rail line, operated by DCTA, acts as an extension of the DART Green line into Denton County. In the Austin area, Capital Metropolitan Transportation Authority operates a commuter rail service known as Capital MetroRail to the northwestern suburbs. The Metropolitan Transit Authority of Harris County, Texas (METRO) operates light rail lines in the Houston area. Amtrak provides Texas with limited intercity passenger rail service. Three scheduled routes serve the state: the daily Texas Eagle ; the tri-weekly Sunset Limited , with stops in Texas; and the daily Heartland Flyer . Texas may get one of the nation's first high-speed rail line. Plans for a privately funded high-speed rail line between Dallas and Houston have been planned by the Texas Central Railway company. Government and politics The current Texas Constitution was adopted in 1876. Like many states, it explicitly provides for a separation of powers. The state's Bill of Rights is much larger than its federal counterpart, and has provisions unique to Texas. State government Texas has a plural executive branch system limiting the power of the governor, which is a weak executive compared to some other states. Except for the secretary of state, voters elect executive officers independently; thus candidates are directly answerable to the public, not the governor. This election system has led to some executive branches split between parties and reduced the ability of the governor to carry out a program. When Republican president George W. Bush served as Texas's governor, the state had a Democratic lieutenant governor, Bob Bullock. The executive branch positions consist of the governor, lieutenant governor, comptroller of public accounts, land commissioner, attorney general, agriculture commissioner, the three-member Texas Railroad Commission, the State Board of Education, and the secretary of state. The bicameral Texas Legislature consists of the House of Representatives, with 150 members, and a Senate, with 31 members. The Speaker of the House leads the House, and the lieutenant governor, the Senate. The Legislature meets in regular session biennially for just over a hundred days, but the governor can call for special