The P-12-42, also known as the Speed Merchant, was a streamlined, 1,200 hp (890 kW) locomotive built between 1957–1958 by Fairbanks-Morse, specifically to operate on each end of the Talgo train produced by American Car and Foundry. This model represented F-M's attempted entry into the lightweight locomotive market, but only four of the low-slung units were produced: the first pair was purchased by the New York, New Haven and Hartford Railroad for their John Quincy Adams train (New York, New York to Boston, Massachusetts), while the second pair went to the Boston and Maine Railroad for their Speed Merchant train (Boston, Massachusetts to Portland, Maine).