served petroleum bulk plants in South Portland north of Rigby Yard. Yard 7 served distribution warehouses and light industries along the south shore of Back Cove. Yard 7 was the interchange with the Grand Trunk Railway until the Portland Junction connection was severed during construction of a highway bridge over the mouth of Back Cove in 1947. Yard 8 served PTM Wharf 3 on the Portland Harbor waterfront along the north shore of the Fore River estuary upstream of Yard 1. Wharf 3 had water frontage of designed for handling bulk commodities from ships and barges of up to draught. PTM #1601-1800 30-foot USRA hopper cars carried coal from this wharf to local industries. The wharf included a storage shed for 4000 tons of china clay transported to the Westbrook paper mill in PTM box cars. Maine Central 35000-series USRA 50-ton, , single-sheathed box cars were repainted PTM #2001-2150 in 1956. Maine Central 4000-series steel box cars were repainted PTM #50-54 in 1966. Wharf 3 was closed about 1970. Yard 8 included the first piggyback ramp served by the Maine Central Railroad. Yard 9 was the old Fore River Yard on the Mountain Division adjacent to the north shore of the Fore River estuary upstream of the dredged channel. Rigby Yard was enlarged to eliminate most activity in Yard 9. Yard 10 served PTM's Thompson Point shops adjacent to the Mountain Division upstream of Yard 9. Thompson Point shops built 49 flat cars, 40 box cars, 3 cabooses, a baggage-RPO and a RPO-smoking car for the gauge Bridgton and Saco River Railroad and Sandy River and Rangeley Lakes Railroad between 1912 and 1917. Yard 11 served large grocery distribution warehouses at Deering Junction where the Boston & Maine WN&P division joined the Maine Central main line to Bangor. Yard 12 served the city of Westbrook including the S. D. Warren Paper Mill. 7,500 carloads originated or terminated in Westbrook in 1973. Rigby Yard (Yard 13) was built in 1922 on the former site of Rigby Park at the South Portland junction of the eastern and western routes of Boston & Maine's Portland division. Rigby became the busiest New England rail yard north of Boston as car storage and locomotive servicing facilities were eliminated from older yards in Portland. Maine Central and Boston & Maine freight trains originated or terminated in Rigby Yard. Yard 12 became the interchange point for Sanford