The Riverfront Loop is a line of the Memphis Area Transit Authority trolley system. It began operation in 1997, as the second line in the system. It runs for 4.1 mi (6.6 km) through downtown Memphis and along the Mississippi riverfront, with 19 stops along the way. It is the longest of the system's three lines, though it concurrent with the Main Street Line for about half of its length. Part of the line offers panoramic views of the Mississippi River from atop to the Chickasaw Bluffs.