 Between 1977–1987 Amtrak would trade 132 of the SDP40Fs back to EMD for F40PHRs.The SDP40F remained in service on the Santa Fe longer than anywhere else, although the arrival of HEP-equipped Superliner cars on the Western routes displaced them from there as well.The last SDP40Fs left the Amtrak roster in 1987, the remaining Amtrak SDP40F's that weren't sold to the ATSF (seen below) are presumed to have been scrapped.