EMD F40PH
The EMD F40PH is a four-axle 3,000 hp (2.2 MW) B-B diesel-electric locomotive, built by General Motors Electro-Motive Division in several variants from 1975 to 1992 and used by Amtrak and commuter railroads on passenger trains. F40PH variants were also built by MK Rail and MotivePower Industries from 1991 to 2000.
History
The F40PH was originally intended to haul short- to medium-length trains on Amtrak's shorter routes. Soon after entering service it also began to replace the long-distance EMD SDP40F (Amtrak's first new locomotive model), which had a troubled reputation after reports of rough riding and several derailments blamed on its C-C trucks (which differed from EMD's freight C-C locomotives). The F40 was based on the EMD GP40-series freight locomotives, with a two-axle truck. (The term "F40" by itself can lead to confusion; the first locomotive with that designation was the F40C, a passenger C-C locomotive derived from the SD40-2, similar to the SDP40F but with an HEP generator.)