Northeast Corridor and Lake Shore Limited services also stop at Back Bay station. The lack of a direct rail connection between North Station and South Station means that passengers transferring to and from the Downeaster are faced with a transfer between stations. Although most such transfers can be achieved using the Orange Line between Back Bay and North Station, Amtrak recommends passengers with luggage to use a taxi. Within the Boston area, most Amtrak services operate over commuter rail track owned by the MBTA, who also own the Northeast Corridor track as far as the Rhode Island state line. Freight rail CSX is the only class I railroad serving the Boston area, which it reaches by its Boston Subdivision line to Springfield, and by trackage rights over the Northeast Corridor. CSX also has trackage rights over much of the southern half of the MBTA's commuter rail network. In February 2013, CSX moved freight operations from its Beacon Park Yard in Allston to a newly refurbished double stack intermodal yard in Worcester and a new transload facility in Westborough. The other significant freight railroad in the Boston area is Pan Am Railways (PAR; formerly known as the Guilford Rail System). PAR is a class II railroad that operates lines to the north and west of Boston, reaching destinations in New Hampshire, Maine and New York as well as Massachusetts. It also has trackage rights over much of the northern half of the MBTA's commuter rail network. In May 2008, PAR announced a venture with Norfolk Southern Railway to create a jointly owned freight corridor, branded the Patriot Corridor, linking Boston to a newly refurbished intermodal yard in Mechanicville, New York, just north of Albany. Only a few rail freight customers remain in or near Boston, including a chemical packager in Allston, and food distribution facilities and a scrap metal processor in Everett. The Class III Fore River Railroad serves two major customers in Quincy. A plan to ship ethanol by rail to a gasoline mixing plant in Revere was reviewed in 2013. In the face of community opposition and pressure from the state legislature, the company withdrew its proposal on July 2, days before the Lac-Mégantic derailment. Water transportation Port of Boston The Port of Boston is a major seaport and the largest port in Massachusetts. It was historically important for the growth of the city, and was originally located in