Msts Midland Mainline Serial
. D5500–5534: 80 mph (129 km/h). Remainder: 90 mph (145 km/h)Power outputEngine: Mirrlees: 1,250 (930 kW) or 1,365 (1,018 kW) English Electric: 1,470 (1,100 kW) At rail: 1,170 hp (870 kW)Maximum: 35,900 (159,691 )Brakeforce49 (488 kN)CareerOperatorsNumbersD5500–D5699, D5800–D5862, later 0Axle load class5 or 6Withdrawn1975–2018DispositionOne in service on main line; 26 preserved, remainder scrapp..