|Number built:||129 (43 3-car sets)|
|Engine:||4 Holec DMKT 52/24 traction motors (25kV AC OHLE)|
|Power:||1, 566 hp (1, 168 kW)|
|Formation:||Driving Motor Standard Open (DMSO)+Pantograph Trailer
Standard Open Lavatory (PTSOL)+DMSO
The Class 323 proved unreliable when first delivered, the traction package causing a number of problems especially with cooling, and it was a couple of years after delivery before they became fully operational. Later on however Northern's fleet won awards for its reliability.
Twenty six sets currently serve with West Midlands Railway (previously London Midland) and seventeen with Northern Rail, operating on electrified commuter lines around Birmingham and Manchester. The EMUs have just completed a retractioning programme replacing the original Gate Turn-Off thyristor equipment with a more advanced Integrated Gate Bipolar Transistor set-up . West Midlands Railway's 323s are due for replacement in a couple of years with a Bombardier Aventra family EMU.
|Northern 323 239 at Crewe|
|LM 323 208 at Erdington|
|LM 323 243 at Smethwick Rolfe Street|
|WMR 323 210 at Alvechurch|
|LM 323 212 at Duddeston|
|LM 323 214 at Redditch|
 Colin J. Marsden, DMU and EMU Recognition (Ian Allan, 2013) p. 262
 Ian Walmsley, "A traction heart transplant", Modern Railways (March 2017) p. 43