Class 90

The Class 90 were part of the third generation of BR Electric 25kV AC locomotives and the last locomotives ordered by BR before sectorisation [1]. They were a development of the Class 87 (and indeed originally were to have been called the Class 87/2 - though the final result was sufficiently different to warrent the creation of a new class). They replaced the first generation AC Electric locos Classes 81-85s. The Class 90s are mixed traffic locomotives and have been used on express passenger and heavy freight services [2]. These days usually the latter.

Number built: 50
Built: 1987-90
Builder: BREL Crewe
Engine: GEC G412CY traction motors (25kV AC OLHE)
Power: 5, 000 hp (3, 728 kW) - continuous
7, 860 hp (5, 861 kW) - maximum
Formation: Bo-Bo

As built they are capable of 110mp/h but just over half the class became dedicated freight locomotives (Class 90/1) with the top speed reduced to 75mp/h, the electric train heating isolated and the brakes improved. After privatisation these were eventually converted back to 90/0 (though some were reclassified as 90/2 for a time).

The Class 90 currently serves with Greater Anglia, Freightliner and DB Scheneker. They have also served with Virgin Trains in the past. One example 90 050 is out of service following a fire.
Freightliner 90 042 heads through Stafford light engine

DB 90 040 and friend head through Stafford
EWS 90 026 leads a convoy through Bletchley

Freightliner 90 046 and friend head through Stafford

Another double header though Stafford! This one led by DB 90 024

[1] Gavin Morrison, AC Electric Locomotives (Ian Allan, 2013) p. 59
[2] Colin J Marsden, Traction Recognition (2nd Edition) (Ian Allan, 2008) p. 90