The P-12-42's eight-cylinder opposed piston engine was rated at 1,600 horsepower (1,200 kW) after 1950, but train lighting and other ancillary loads ("hotel" power) used about 25% of output, leaving 1,200 horsepower (890 kW) for traction. 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). 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. An FM P-12-42, Boston and Maine Railroad #1Ĥ00 hp (300 kW) Head end power from prime mover
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