This was an Anglia Intercity arrival, I think, into Norwich Thorpe Street in the Fall of 2000, and one of my first close photos of English, Welsh, & Scottish Class 67 diesels. If the chassis of it looks vaguely F59PHI to you, that would be close. It is a GMLG locomotive, but its capabilities are far beyond anything GM builds for the U.S. market. 125 m.p.h. is an easy job for these locomotives, although being mostly assigned to mail, fast freight, and excursion trains they in reality rarely exceed 100.