Following the negative reaction in some quarters to earlier EMUs built in the 1980s the Class 321 had a deal of attention paid to its external appearance with the aim to produce a train "eye catching" on the outside and comfortable on the inside .
|Number built:||468 (117 4-car units)|
|Engine:||4 Brush TM2141B traction motors (25kV AC OHLE)|
|Power:||1, 438 hp (1, 072 kW)|
|Formation:||(321/3) Driving Trailer Composite Open (DTCO)+Motor Standard
Open (MSO)+Trailer Standard Open Lavatory (TSOL)+
Driving Trailer Standard Open (DTSO)
The original NSE batch became known as the 321/3 with the London Midland batch the 321/4 (they have more first class seats than the 321/3s ) and the Yorkshire units 321/9. Unlike the other sub-classes these units did not have first class seating and so had 2 DTSOs instead of a DTCO and a DTSO.
321/3s still work on the Great Eastern route, thirty of the units are receiving a "Renatus" refurbishment and upgrade which includes new air conditioning, seating and wi-fi. Some 321/4s have been transferred to bolster the 321/3 fleet.
Class 321s are currently operated by Greater Anglia and Northern. Both fleets are due for replacement by new build EMUs at the end of the decade.
|Greater Anglia (but in Great Northern livery) 321 408 at Romford|
|321 408 heads off Colchester bound|
 Colin J Marsden, DMU and EMU Recognition Guide (Ian Allan, 2013) p. 256
 David Lawrence, British Rail Designed 1948-97 (Ian Allan, 2016) p. 236
 Alec Swain, Overhead Line Electric Multiple Units (Ian Allan, 1990) p. 76
 John Glover, Eastern Electric (Ian Allan, 2001) p. 131