Boston Sand and Gravel has an agreement with Pan Am to operate its shortline New Hampshire Northcoast Railroad trains from Ossipee, New Hampshire to just north of Boston's North Station to supply aggregates to its plant on the Boston/Cambridge border. An occasional move occurs with run-through power from Norfolk Southern Railway to supply coal the Merrimack Station power plant in Bow, New Hampshire, over the Fitchburg Line. The Haverhill and Fitchburg lines also host four to six Pan Am manifest freight trains per day.