D400's English Electric works plate photographed at Yeovil Junction on 5 January 1992. Note that there is obviously no mention of the BR number, only the EE number 3770 and the works number D11411. The locomotive was handed over to BR on 3 October 1967, entering service a few days later. Only three other members of the class entered service during 1967, with the remainder arriving during 1968. The class was complete with the arrival of D449 (50049) in mid December 1968.