Company in 1967, at its complex on Roosevelt Boulevard at Adams Avenue, at the cost of $1 million, in anticipation of future service. This station was destroyed when the facility was demolished in October 1994. Ultimately the Northeast Expressway was never built, due to lack of funds, and the subway extension remained a paper concept. On September 10, 1999, SEPTA filed a Notice of Intent to prepare an Environmental Impact Statement for the Northeast Extension with the EPA. In December 2001, the Philadelphia City Planning Commission supported extending the Broad Street Line along Roosevelt Blvd. to Bustleton Avenue, where it would be joined by the Market–Frankford Line, extended from its Frankford terminal (now the rebuilt Frankford Transportation Center). The estimated cost had ballooned to $3.4 billion. Philadelphia Naval Yard Currently, the Broad Street Line terminates southbound at NRG station at Pattison Avenue and three major stadiums. With the redevelopment of the Philadelphia Naval Yard directly to the south, a Health Impact Assessment report was issued in March of 2012 to determine if extending the line to the Naval Yard would be a viable option for commuters. It determined that extending the line to the Naval Yard would more than halve the number of private cars commuting back and forth, with the remainder taking the proposed subway line and/or using a bicycle sidepath. The HIA recommends making an extension of the Broad Street Line a priority, and recently, the extension has garnered much support. West Philadelphia A report in the 1940s proposed an extension of the Locust St. subway to West Philadelphia. This line would have run under one of the streets presently served by the subway-surface system. Presumably, the current subway-surface lines would have been converted to bus operation and would have been used to feed this line. It appears that this proposal was replaced by the extension of the subway portion of the subway-surface system in the 1950s. Northwest The same report also proposed a northwest extension. This would have branched off at the North Philadelphia station and would have taken over the Pennsylvania Railroad's Chestnut Hill Branch which is still operated today as part of the SEPTA Regional Rail system as the Chestnut Hill West Line. Operation Rolling stock The first set of rail cars for the Broad Street subway was the B-1 cars built in 1926–27 by the J.G. Brill Company. The Pressed Steel Car Company supplied