▁trail ▁does ▁not ▁follow ▁any ▁part ▁of ▁the ▁Southern ▁New ▁England ▁Railway , ▁a ▁rail road ▁intended ▁to ▁run ▁from ▁Pal mer , ▁Massachusetts ▁to ▁Prov idence , ▁whose ▁right - of - way ▁was ▁partially ▁constructed ▁but ▁never ▁completed . ▁R ather , ▁this ▁rail road ▁was ▁built ▁as ▁the ▁Nor folk ▁County ▁Rail road , ▁east ▁of ▁the ▁Black stone ▁station , ▁and ▁the ▁South bridge ▁and ▁Black stone ▁Rail road ▁west ▁of ▁the ▁station ▁to ▁the ▁Connecticut ▁state ▁line . ▁Later , ▁the ▁route ▁became ▁part ▁of ▁the ▁New ▁York ▁and ▁New ▁England ▁Rail road , ▁which ▁was ▁absor bed ▁by ▁the ▁New ▁H aven ▁Rail road . ▁ ▁The ▁trail ▁is ▁dis continu ous , ▁as ▁inter ru ptions ▁to ▁the ▁trail ▁are ▁at ▁Massachusetts ▁Route ▁ 1 4 6 , ▁a ▁missing ▁bridge ▁over ▁Route ▁ 1 4 6 A ▁ ▁in ▁U x bridge , ▁and ▁a ▁bridge ▁over ▁the ▁Black stone ▁River ▁and ▁R te . ▁ 1 2 2 ▁in ▁Black stone , ▁just ▁north ▁of ▁the ▁Rh ode ▁Island ▁state ▁line . ▁In ▁a ▁four - year ▁project ▁ending ▁in ▁ 2 0 1 6 , ▁ 8 ▁brid ges ▁and ▁ 1 ▁cul vert ▁were ▁rep a ired , ▁replaced , ▁or ▁built , ▁including ▁the ▁Tri ad ▁bridge ▁in ▁Mill ville ▁over ▁the ▁Black stone ▁River ▁and ▁Prov idence ▁and ▁Wor c ester ▁Rail road . ▁These ▁are ▁the ▁two ▁Factory ▁P ond ▁Br id ges , ▁the ▁northern ▁Canal ▁Street ▁Bridge