British Rail Class 123

British Rail Class 123
In service	1963-
Manufacturer	BR Swindon Works
Number built	1963
Formation	unknown
Operator	British Rail
Specifications
Car length	64 ft 11 1/4 in
Width	9 ft 3 in
Height	12 ft 9 1/2 in
Maximum speed	70 mph (112 km/h)
Weight	41 tons 14 cwt

The Class 123 was a design of Diesel Multiple Unit built for British Rail in 1963. They were built by British Rail at Swindon Works, and designed like all Swindon units as inter-city sets. Ten of the four-car sets were built and introduced in 1963. The units bear a visible similarity to the British Rail Class 309, however there is no 'relation' here as the two types were built by different manufacturers for different markets.