 A extension from Concord Center to Concord Prison (Reformatory Station on Elm Street) would give the name Reformatory Branch to the Bedford-Concord segment in 1879.The branch continued another half mile further west to a junction (called "Concord Junction" or "Middlesex Junction" per different sources) with the Nashua, Acton & Boston Railroad and other rail lines.The independent Billerica and Bedford Railroad built a connecting narrow-gauge line in 1877, but went bankrupt the next year.