Map of the Boston & Lowell R.R. system with its principal connections. Map of the northern United States showing cities and towns and the railroad network with emphasis on the main line. This line was chartered in 1830 and opened in 1835. In 1841 a second track was laid. Rand Avery Supply Co. CREATED/PUBLISHED [n.p., 1890?] Scale ca. 1:1,000,000.