The A and B Loop is a streetcar circle route of the Portland Streetcar system in Portland, Oregon, United States. Operated by Portland Streetcar, Inc. and TriMet, it consists of two services within the Central City that travel a loop between the east and west sides of the Willamette River by crossing the Broadway Bridge (pictured) in the north and Tilikum Crossing in the south. The services connect Portland's downtown, Pearl District, Lloyd District, Central Eastside, and South Waterfront. Portland city officials considered an eastside streetcar extension upon authorizing the Central City Streetcar project in 1997. After several years of planning, the Portland Streetcar Loop Project was approved and held its groundbreaking in 2009. It opened between the Broadway Bridge and the Oregon Museum of Science and Industry on September 22, 2012. The opening of Tilikum Crossing in 2015 further extended its tracks from the museum to the South Waterfront and completed the loop. (Full article...)