BREL BR 423

Built by BREL

Top speed

140 km/h

87 mph

Power output

750 kW

1,006 hp

Track gauge

1,435 mm

Standard gauge

Years built

1967–1974

Overview of the BREL BR 423

Explore the BR 423, an electric multiple unit designed for British railways.

Built by BREL between 1967 and 1974, this train series, including BR 423/1 and SWT 423/1 classes, marked a significant era for South West Trains in the United Kingdom.

With a top speed of 140 km/h and a typical 4-car formation, the BR 423 provided an efficient transport solution.

These trains operate on standard gauge 1435 mm track and run on 750 V DC from a third rail, delivering a power output of 750 kW.

The BR 423 embodies British railway engineering, combining performance and reliability for passenger transport.

BREL BR 423 technical specifications

	Value	Imperial / US
Series	BR 423
Built by	BREL · 1967–1974
Top speed	140 km/h87 mph	87 mph
Power output	750 kW1,006 hp	1,006 hp
Electric systems	750 V DC (3rd rail)
Track gauge	1,435 mmStandard gauge4 ft 8½ in	4 ft 8½ in
Formation	4 cars
Car length	20.3 m66 ft 7 in	66 ft 7 in
Width	2.82 m9 ft 3 in	9 ft 3 in
Height	3.89 m12 ft 9 in	12 ft 9 in