Class 387 Electrostar

The Class 387 is the final development of the Electrostar family having a higher top speed of 110mp/h. When the final carriages were built in November 2017 [1] it bought to an end eighteen years of continuous Electrostar production with a grand total of 2,805 carriages built of the Classes 357, 375, 376, 377, 378, 379 and 387 [2].
GWR 387 133 at Ealing Broadway



Information
Number built: 428 (107 4-car sets)
Built: 2014-17
Builder: Bombardier Derby
Engine: Bombardier MITRAC DR1000 traction system
(750v DC third rail and 25kv AC OHLE)
Power: 2, 250 hp (1, 900 kW)
Formation: Driving Motor Composite Open (DMCO)+Motor Second Open
(MSO)+Trailer Second Open (TSO)+DMCO

The Class 387 is in service with Great Northern, Great Western Railway, Gatwick Express and Heathrow Express. They were also in service with Thameslink until being transferred to Great Northern after being replaced by Class 700s and also c2c for a time.

Extermally Class 387s look the same as the likes of the Class 377. Class 387/1s are in service with Great Northern, Heathrow Express and GWR. 387/2s with Gatwick Express and Great Northern and 387/3s with Great Northern. 
Thameslink 387 113 at London Blackfriars

Thameslink 387 103 at Bedford

Gatwick Express 387 223 on a test run through Stafford

GWR 387 156 arrives at Ealing Broadway

Thameslink 387 103 at Bedford, its replacement a Class 700 behind it

[1] Roger Ford, "Rolling stock factories over-capacity threat", Modern Railways (December 2017) p. 25
[2] "Last-ever Electrostar finished in Derby as 18 years of production come to an end" <http://www.railtechnologymagazine.com/rail-news/last-ever-electrostar-finished-in-derby-as-18-years-of-production-come-to-an-end>