The B&M had built its own branch line to Lowell in 1874 , after the B&L 's monopoly ran out in 1865 , and it closely paralleled the L&L 's main line .
B&M was not worthwhile for the B&M to maintain two line between Lowell and Lawrence .
The B&M had built its own branch line to Lowell in 1874 , after the B&L 's monopoly ran out in 1865 , and it closely paralleled the L&L 's main line , meaning it was not worthwhile for the B&M to maintain two line between Lowell and Lawrence .