British Rail Class 309

British Railways AM9
British Rail Class 309
*Clacton Express*
British Railways AM9; British Rail Class 309; Clacton Express
	A Class 309 undergoing testing in 1962
In service	1963–2000
Manufacturer	British Rail
Order no.	30675 (75962-75968); 30676 (61925-61931); 30677 (70253-70259); 30678 (75969-75975); 30679 (75637-75644); 30680 (61932-61939); 30681 (69100-69107); 30682 (75976-75983); 30683 (75984-75991); 30684 (61940-61947); c30707 (69108); 30871 (71107-71110); 30872 (71111-71114); 30893 (71277-71280); 30954 (71569-71576); 31001 (71754-71761);
Built at	Holgate Road, York; Wolverton Works;
Family name	1962 Express
Replaced	BR Standard Class 7
Constructed	1962–1963; 1973–1974; 1980–1981; 1987;
Entered service	1963
Refurbished	1985–1987
Scrapped	1992–1994; 2001–2004;
Number built	24
Number preserved	2 (plus 1 additional vehicle)
Number scrapped	22
Successor	Class 321; Class 323;
Formation	2, 3 or 4 cars per trainset: DMBSK+BDTS (309/1); BDTC+MBSK+TRB+DTC (309/2); BDTC+MBSK+TSO+DTC (309/3); DMBS+TS+TC+BDTS (309/1 - modified, 309/4); BDTC+MBS+TS+DTS (309/3, modified);
Diagram	EB206, EB207, BR421 (61940-61947); ED209, ED218, BR418 (61925-61931, 61932-61939); BR426 (69100-69107); BR495 (69108); EE229, BR448 (75969-75975); EE229, BR447 (75976-75983); EF216, EF209, BR446 (75984-75991); EF301, EF305, BR448 (75637-75644, 75962-75968); EH206, EH229, BR471 (70253-70259); EH207, EH227, BR469 (71107-71110); EH209, BR476 (71277-71280); EH220, EH227 (71569-71572); EH228 (71754-71761); EH306, EH309, BR462 (71111-71114); EH309 (71573-71576);
Fleet numbers	309/1:; 601-608, later 309601-309608 (sets); 61940-61947 (DMBSK); 75984-75991 (BDTS); 309/2:; 611-618 (sets); 75637-75644 (BDTC); 61932-61939 (MBSK); 69100-69107 (TRB); 75976-75983 (DTC); 309/3:; 621-627, later 309621-309627 (sets); 75962-75968 (BDTC); 61925-61931 (MBSK); 70253-70259 (TSO); 75969-75975 (DTC);
Capacity	108S (309/1); 36F/112S/32U (309/2); 36F/176S (309/3); 24F/196S (309/1, modified); 18F/194S (309/3, modified);
Operators	Eastern Region of British Rail, Network Southeast, First North Western
Depots	Clacton,Longsight Electric TMD
Lines served	Sunshine Coast Line, Great Eastern Main Line, Crewe–Manchester line
Specifications
Car body construction	Steel
Train length	132 ft 9+1⁄4 in (40.469 m) (2-car); 265 ft 8+1⁄2 in (80.988 m) (4-car);
Car length	64 ft 6 in (19.66 m) (over body)
Width	9 ft 3 in (2.819 m) (overall)
Height	12 ft 9.5 in (3.899 m) (overall)
Doors	Slam
Wheelbase	46 ft 6 in (14.173 m) (bogie centres)
Maximum speed	100 mph (161 km/h)
Weight	309/1 Total: 99 long tons (101 t; 111 short tons); 309/2: Total: 168 long tons (171 t; 188 short tons); 309/3 Total: 167 long tons (170 t; 187 short tons);
Traction system	Electric Multiple Unit
Traction motors	4 × GEC WT401 of 210 kW (280 hp)
Power output	1,128 hp (841 kW)
Acceleration	0.41 m/s2 (0.92 mph/s)
HVAC	Electric
Electric system(s)	25 kV AC OHLE
Current collector(s)	Pantograph
UIC classification	Bo′Bo′+2′2′ (309/1); Bo′Bo′+2′2′+2′2′+2′2′ (309/1 modified); 2′2′+Bo′Bo′+2′2′+2′2′ (others);
Bogies	Commonwealth
Braking system(s)	Air (EP/Auto)
Coupling system	Buckeye (outer); Solid shank (inner);
Multiple working	Classes 302–312
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 309 "Clacton Express" electric multiple units (EMUs) were built by British Rail (BR) York Carriage Works from 1962 to 1963. They were initially classified as Class AM9 before the introduction of TOPS. These units were the first express 25 kV alternating current (AC) units to be built by British Rail and were their first EMUs capable of 100 mph.

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