British Rail Class 321

British Rail Class 321
British Rail Class 321
	Greater Anglia Class 321 at Colchester in 2018
	Standard-class interior of an unrefurbished Greater Anglia unit
In service	1988–present
Manufacturer	British Rail Engineering Limited
Built at	Holgate Road Works, York
Family name	BR Second Generation (Mark 3)
Replaced	Class 307
Constructed	1988–1991
Refurbished	2013–2017
Number built	117; (66 × 321/3, 48 × 321/4, and 4 × 321/9)
Number in service	8; (plus 12 converted to Cl. 320/4)
Number scrapped	64
Successor	Class 331 (Northern Trains); Class 350 (London Midland); Class 387 (Great Northern); Class 720 (Greater Anglia);
Formation	4 cars per unit;; 321/3 and /4 units:; DTCO-PMSO-TSO-DTSO; 321/9 units:; DTSO-PMSO-TSO-DTSO;
Diagram	(See § Vehicle numbering)
Fleet numbers	321/3: 321301–321366; 321/4: 321401–321448; 321/9: 321901–321903;
Capacity	As-built:; 321/3: 313 seats; (20 first-class, 293 standard); From 2015:; 321/3: 303 seats; (16 first-class, 287 standard); 321/4: 299 or 307 seats; (16 or 28 first, 271 or 291 std.); 321/9: 309 seats; (all standard-class);
Owners	Eversholt Rail Group; Varamis Rail;
Operators	Current:; Varamis Rail; Former:; Arriva Rail North; Arriva Trains Northern; Central Trains; First Capital Connect; First Great Eastern; Greater Anglia; London Midland; London Overground; National Express East Anglia; Network SouthEast; Northern Rail; Northern Trains; Regional Railways; Silverlink;
Specifications
Car body construction	Steel
Train length	80.92 m (265 ft 6 in)
Car length	DT vehs.: 19.950 m (65 ft 5.4 in); Others: 19.920 m (65 ft 4.3 in);
Width	2.816 m (9 ft 2.9 in)
Height	3.775 m (12 ft 4.6 in)
Doors	Double-leaf sliding pocket, each 1.200 m (3 ft 11.2 in) wide; (2 per side per car)
Wheelbase	Over bogie centres:; 14.170 m (46 ft 5.9 in)
Maximum speed	100 mph (161 km/h)
Weight	DTCO vehs.: 29.3 t (28.8 long tons; 32.3 short tons); PSMO vehs.: 51.5 t (50.7 long tons; 56.8 short tons); TSO vehs.: 28.8 t (28.3 long tons; 31.7 short tons); DTSO vehs.: 29.1 t (28.6 long tons; 32.1 short tons);
Traction motors	As built: 4 × Brush TM21-41C,; each of 248 kW (332 hp); Renatus: 4 × TSA TME 52-35-4,; each of 300 kW (402 hp);
Power output	As built: 990 kW (1,328 hp); Renatus: 1,200 kW (1,609 hp);
Acceleration	As built: 0.55 m/s2 (1.2 mph/s); Renatus: 0.60 m/s2 (1.3 mph/s);
Electric system(s)	25 kV 50 Hz AC overhead
Current collector(s)	Pantograph
UIC classification	2′2′+Bo′Bo′+2′2′+2′2′
Bogies	Powered: BREL P7-4; Unpowered: BREL T3-7;
Minimum turning radius	71 m (232 ft 11 in)
Braking system(s)	Electro-pneumatic (disc)
Safety system(s)	AWS; TPWS;
Coupling system	Tightlock
Multiple working	With Classes 317–322
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Notes/references
	Specifications as at October 1988 except where otherwise noted.

The British Rail Class 321 is a class of electric multiple unit (EMU) passenger train built by British Rail Engineering Limited's York Carriage Works in three batches between 1988 and 1991 for Network SouthEast and Regional Railways. The class uses alternating current (AC) overhead electrification. The design was successful and led to the development of the similar Class 320 and Class 322.

After operating for various trains operating companies after the privatisation of British Rail, they were latterly operated by Greater Anglia until April 2023. Some have been converted to Class 320 and are operated by ScotRail.

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