operator in 1989. Maine Central Railroad Portland Division from Bangor, Maine entered Portland from the north inland of Back Cove. Maine Central Railroad Mountain Division from St. Johnsbury, Vermont entered Westbrook from the northwest paralleling the old canal along the Presumpscot River. The Mountain Division was abandoned in 1983. Boston and Maine Railroad Worcester, Nashua and Portland Division from Rochester, New Hampshire entered Westbrook from the west. The Boston & Maine discontinued passenger service in 1932 and through-freight service in 1934. The line operated as the Sanford and Eastern Railroad from 1949 until abandonment in 1961. Boston and Maine Railroad Portland Division Eastern Route from Boston entered South Portland from the south, and was dismantled in 1945. Boston and Maine Railroad Portland Division Western Route from Boston entered South Portland from the south. Union Station had eastern and western yards along the Boston to Bangor main line between Rigby Yard and Yard 11. The PTM assembled trains in these yards and added mail and express cars to through trains. Following a 1933 joint operating agreement between the Maine Central and the Boston & Maine, passenger trains from Bangor and points east to Boston or Worcester, Massachusetts, and points south ran through Union Station with pooled equipment like the Gull and the Flying Yankee. Other Maine Central and Boston & Maine passenger trains originated or terminated at Union Station. Grand Trunk trains originated or terminated about east of Union Station without using Union Station. Union Station was razed in 1961. Yard 1 served PTM Wharf 1 on the Portland Harbor waterfront along the north shore of the Fore River estuary upstream of Yard 2 and downstream of yard 8. Wharf 1 had water frontage of and included a warehouse for handling package cargo interchanged with ships of up to draught. Yard 2 served Portland Harbor waterfront wharves along the north shore of the Fore River estuary upstream of the Grand Trunk wharves and downstream of Wharf 1. Yard 2 became the local interchange with the Grand Trunk Railway after 1947. Yard 3 along the original Boston & Maine eastern route served the South Portland waterfront of the Fore River estuary including PTM Wharf 4, the New England Shipbuilding Corporation and the Portland-Montreal Pipe Line terminal. Yard 4 team tracks and less-than-carload (LCL) transfer facilities inland of Yard 1 and Yard 2. Yard 5 car storage inland of Yard 8. Yard 6