Metro Streetcar begins operations at approximately 8:30 a.m. Monday through Saturdays and at 10 a.m. Sundays, while it ends at approximately 10 p.m. Monday through Wednesdays, midnight on Fridays and Saturdays and at 5:30 p.m. on Sundays. It consists of two lines: the Blue Line and the Green Line. The Blue Line operates seven days a week, with extended service on Friday and Saturday nights and runs between Little Rock and North Little Rock, while the Green Line operates six days a week only with no Sunday service and runs in a circulator. Frequencies per line consist of 25-minute headways during the day, with 20-minute headways during evening and night-and-weekend service periods. Stations The trolley stops at many downtown attractions, from the Clinton Library to the historic River Market. The stops include the Marriott Hotel, Heifer Intl., and the Historic Arkansas Museum. Stations continue into the rapidly rejuvenating area of North Little Rock known as Argenta. Stops there include access to the USS Razorback (SS-394) WW II submarine, trolley barn, Verizon Arena, and the Dickey-Stephens Park (home of the Arkansas Travelers). The stops are indicated with -tall black signs and yellow sidewalk "bumps" curbside with the system map posted at each stop. Trolleys cannot be hailed between stops. Both stops and cars can be sponsored for a donation. Lines Blue Line Green Line Stop list Highlighted stops indicate daytime only service Expansion Additional extensions to the system are under discussion, the most ambitious of which is a extension to Little Rock National Airport. If the expansion is completed, the status of the line could take on a role as some form of light rail line, instead of its current role as a heritage trolley. The proposed extension, among others in Savannah and Tampa, is considered a hybrid form of transport known as "rapid streetcar". The expansion of the River Rail Streetcar line, turning it into a more effective rail rapid transit line, would be the first example of such a system in the United States. Rolling stock Metro Streetcar initially used three replica vintage electric trolleys. Two more streetcars were added as a part of the new Phase II extension. The design of these cars is generally similar to Birney-type streetcars used in Little Rock until after World War II. The original number series for those cars was 400–407. The present cars continue that number series, albeit 60 years later,