Unlike the main line, the Winthrop Loop was not paralleled by mainline railroads or Boston Elevated Railway (BERy) streetcar lines. The town of Winthrop rejected plans for BERy to provide bus service. Instead, Saugus Transit began operating Winthrop Beach - Maverick bus service as soon as the BRB&L was abandoned. When its 60-day contract expired on March 26, Rapid Transit, Inc. took over service. The two routes split at Winthrop Beach and roughly paralleled the two halves of the Loop; some service also operated through to Point Shirley.