By the mid-1980s, it had already been decided that gas turbine manufacturing operations at the Lester, PA plant would cease by the end of 1986, and, also, that manufacturing of the popular W501D5 engines would be outsourced from the MHI plant in Takasago, Japan. This plan enabled CTSD to put into place at least a temporary means of continuing doing business - to obtain and fulfill orders for large gas turbines as the US cogeneration and IPP markets were developing. (As noted earlier, the first MHI-built engines were installed at the Texas City Cogen plant. According to internal records, the total number of W501D5s purchased by Westinghouse from MHI was 10, as were the first four 501F engines, below.)