This is not the Pascoag Line, part of the Providence and Springfield Railroad, which ran from Pascoag to the Cove depot in Providence, Rhode Island.

Blackstone - 1886 (Boston and Pascoag Line)
U.S. Geological Survey Historical Topographic Map Collection, scale 1:62,500.

Franklin - 1887 (Midland Division)
U.S. Geological Survey Historical Topographic Map Collection, scale 1:62,500.

Boston - 1893 (Woonsocket Division New York and New England Railroad, Boston and Albany Railroad Brookline Branch
U.S. Geological Survey Historical Topographic Map Collection, scale 1:62,500.