Haverhill Line express trains, run on the Lowell Line from North Station to Wilmington, then follow the Wildcat Branch to the Haverhill Line. This routing is used to avoid the inner Haverhill Line, which has a number of single-track sections. The line is the designated freight clearance route into Boston from the north; all stations with high-level platforms must either have mini-high platforms or a freight passing track. Pan Am Railways runs freight on the line, including local freights based out of Lawrence Yard and DOBO (a Dover to Boston through freight). Station listing Woburn Branch References External links MBTA - Lowell Line Design, Environmental Review, and Financial Plan for Commuter Rail extension from MA to NH | New Hampshire DOT MBTA Commuter Rail