The EMD F40PH is synonymous with the Amtrak era of American passenger trains.
Although it has been retired from Amtrak service, it operated for over 20 years
and today it continues to be the motive power for commuter railroads such as VRE,
MBTA, Caltrain, Metrolink, and Metra) and more all over the United States.
Over 500 F40PH locomotives have been manufactured by EMD in various configurations.
To support passenger service, the F40PH is equipped with a secondary electrical generator
referred to as the head end generator (or HEP, for Head End Power). The need for
constant frequency power means that these HEP units are constantly running at 900rpm,
resulting in the nickname “Screamers” for the units due to the sound.
As of 2023, Chicago Metra owns and operates the largest number of surviving F40PH engines – 118. Starting in 2017 Metra began repainting certain locomotives to commemorate historic railroads or special events. In 2022 F40PH #104 was added to the roster of special Metra engines when it received a one-of-a-kind “City of Chicago” livery. The shades of blue with red stars are a direct reference to the Chicago city flag, while the skyline silhouette below the cab windows pay homage to the area that Metra is proud to serve and call home.