sentences:  Significant communities developed around a series of mills that were built on the river in the early part of the 19th-century , leading to the establishment of Boynton, Tomifobia [formerly Smith's Mills], and Stanstead Plain [Kilborn's Mills].Each of these villages became stops along an important stagecoach and later railroad route between Boston and Montreal (the Massawippi Valley Railroad became part of the Boston and Maine Railroad network in 1867).The Tomifobia Nature Trail, formerly a CP Rail/Quebec Central Railway bed, borders much of the river between the villages of Ayer's Cliff, Quebec and Beebe Plain, passing through the hamlets of Tomifobia and Boynton.