They represent some of the last vestiges of Boston's once-extensive trolley and trackless trolley network. Many of today's bus and trackless trolley routes were once streetcar lines. Watertown is served by several MBTA bus and trackless trolley routes. Trackless trolley service was restored in December 2016. SEPTA City Transit Division surface routes include bus and trackless trolley lines. Sea Isle City used to have a trackless trolley service that operated along Landis Avenue. Smaller trackless trolley systems were built in the US early as well. The trackless trolley was often seen as an interim step, leading to streetcars. SEPTA Route 66 is a trackless trolley route in Northeast Philadelphia, Pennsylvania, United States.