The BW&PS and the EJBSP&PS, along with the Boston & Winthrop (a "paper railroad" proposed but never built) were merged late in 1883 and operated thereafter as the Boston, Winthrop & Shore RR. In 1885, after a storm, sections of line were abandoned, and the management of the BRB&L stepped in. A circuit or loop line was constructed in 1888 and existed until the 1940 demise of the BRB&L. It used parts of the original alignment of the BW&PS. Most of the line, however, was built brand new, serving Winthrop Highlands, Winthrop Center and Winthrop Beach. The loop was double-tracked in 1903.