British Rail Class 387

British Rail Class 387 Electrostar
Great Western Railway Class 387 unit at Didcot Parkway
The interior of a GWR Class 387 unit
In service	8 December 2014 – present
Manufacturer	Bombardier Transportation
Built at	Derby Litchurch Lane Works
Family name	Electrostar
Replaced	Class 317 (Great Northern) Class 321 (Great Northern) Class 332 (Heathrow Express) Class 365 (Great Northern) Class 442 (Gatwick Express)
Number built	107
Successor	Class 700 (Thameslink)
Formation	4 cars per unit: DMSO-MSO-PTSO-DMSO
Operators	Current: Gatwick Express Great Northern Great Western Railway Heathrow Express Southern Former: Thameslink c2c
Specifications
Car length	20.39 metres (66 ft 11 in)
Width	2.80 metres (9 ft 2 in)
Height	3.77 metres (12 ft 4 in)
Maximum speed	110 mph (177 km/h)
Traction system	IGBT-VVVF (Bombardier MITRAC DR1000)
Power output	1.68 MW (2,250 hp)
Electric system(s)	25 kV 50 Hz AC overhead 750 V DC third rail
Current collector(s)	Pantograph (AC) Contact shoe (DC)
UIC classification	2′Bo′+2′Bo′+2′2′+Bo′2′
Safety system(s)	AWS TPWS ETCS (HX & GN units only)[1]
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 387 Electrostar is a type of electric multiple unit passenger train built by Bombardier Transportation. They are part of the Electrostar family of trains. A total of 107 units were built, with the first train entering service with Thameslink in December 2014. The trains are currently in service with Gatwick Express, Great Northern, Great Western Railway, Heathrow Express and Southern. The Class 387 is a variation of the Class 379 with dual-voltage capability which allows units to run on 750 V DC third rail, as well as use 25 kV AC OLE. The class were the final rolling stock orders from the Bombardier Electrostar family with 2,805 vehicles built over 18 years between 1999 and 2017.^[2]