In 1977,
Amtrak borrowed SNCF CC21003 for testing purposes. This engine was rebuilt by Alstom with its transformer and electrical components replaced with those compatible with
Amtrak's 25 Hz traction power system, taller pantographs, Amtrak's cab signaling system, US style couplers, a bell, and other components required by the
AAR for operation on US railroads, including a Nathan P01235 air horn used on the more well known
E60s. This engine and a Swedish
SJ Rc4 were imported and tested by Amtrak to determine the best design to replace the aging
PRR GG1's operating on their
Northeast Corridor. They were numbered by Amtrak as X996 and X995 respectively. However, the X996's suspension system proved unsuitable for the relatively rough US track construction, and despite modifications made over the course of testing, the engine's performance was deemed unsatisfactory for Amtrak's use. Thus, Amtrak favored the Rc4 design, which would serve as the basis for their
EMD AEM-7. After testing was completed, X996 was returned to France, reverted to its pre-Amtrak appearance and specifications, and continued to operate on the SNCF until withdrawn and scrapped in 2005. ==Disposal==