British Rail Class 799

British Rail Class 799
*HydroFLEX*
British Rail Class 799; HydroFLEX
	The prototype unit, number 799001
Manufacturer	As Class 319:; British Rail Engineering Limited; Conversion to Class 799:; Porterbrook,; University of Birmingham CRRE;
Family name	BR Second Generation (Mark 3)
Constructed	2019, 2021
Number built	2
Number scrapped	1
Formation	4 cars per unit
Fleet numbers	799001, 799201
Specifications
Car body construction	Steel
Car length	Outer vehicles:; 19.830 m (65 ft 0.7 in); Intermediate vehicles:; 19.920 m (65 ft 4.3 in);
Width	2.816 m (9 ft 2.9 in)
Height	3.774 m (12 ft 4.6 in)
Wheelbase	Over bogie centres: 14.17 m (46 ft 6 in)
Prime mover(s)	Ballard FCveloCity
Engine type	Hydrogen fuel cell
HVAC	Electric heating
Electric system(s)	25 kV 50 Hz AC overhead; 750 V DC third rail;
Current collector(s)	Pantograph (AC); Contact shoe (DC);
Braking system(s)	Electro-pneumatic (disc)
Safety system(s)	AWS; TPWS;
Coupling system	Tightlock
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 799 HydroFLEX is a prototype class of bi-mode multiple unit adapted from Class 319 electric multiple units (319001/382). The existing 25 kV AC and 750 V DC equipment has been retained with a hydrogen fuel cell added, currently taking up one of the carriages.

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