Back in the B&M days, the short stretch from the Lowell Jct area over to Tewksbury had many good customers, including Liquid Carbonic, Demoulas, Tewksbury Auto Parts, a couple warehouses/DC's (maybe Cressy Dockham & Anderson Windows), a lumber company, Gilette and either a Weyerhauser or GP facility on the Western Route just south of Lowell Jct where the line goes under I-93. As far as I know, only Liquid Carbonic (now Praxair) still gets cars. Most of those places are long gone, except for Demoulas, who got fed up during the strikes and never did rail again.