Class 323

The Class 323 is a fleet of high-density electric multiple units built in the early 1990s for British Rail. They were built to replace older EMUs coming to the ends of their lives and to supply the Birmingham Cross-City Line which was finally being electrified [1]. Forty three 3-car units were built by Hunslet Transportation Projects during 1992-3 for the Cross City Line and the North West for services to Manchester Airport.

Number built: 129 (43 3-car sets)
Built: 1992-93
Builder: Hunslet TPL
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 [2]. 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

[1] Colin J. Marsden, DMU and EMU Recognition (Ian Allan, 2013) p. 262
[2] Ian Walmsley, "A traction heart transplant", Modern Railways (March 2017) p. 43