Mattapan Sq. from R.R. Depot Mattapan Sq. from R.R. Depot No. 1025 Postcard. Caption on front: Mattapan Sq. from R.R. depot. Postally unused. On verso: The Royal Blue card. Pub. by Putnam Art Co., Grove Hall, Boston. Facebook Twitter Print Friendly Skills Dorchester, Mattapan Square, Trolley Posted on November 29, 2022 ← Car Barn, Neponset Bridge Gibson Playground, Dorchester, Mass. →