The Speed Merchant or Talgo Train was a bi-directional five-car train used by the Boston and Maine Railroad in commuter service between 1958 and 1964 on the road's Eastern and Western routes. Power for the train was from two Fairbanks-Morse P-12-42 diesel-electric locomotives, one at each end of the train, connected by multiple-unit control. Fairbanks-Morse referred to the locomotives as "Speed Merchants" in its promotional literature, but the Boston and Maine never used this; B&M timetables simply called it the "Talgo Train" in advance announcements but, once the train entered service, no names were attached in the printed schedules.