E217 series

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E217 series
Yokosuka Line - Sōbu Line E217 series train

In service	1994 - Present
Formation	11+4 or 10+5 cars per trainset
Operator	JR East
Depots	Kamakura, Kōzu
Lines served	Yokosuka Line, Sōbu Main Line, Tōkaidō Main Line
Specifications
Maximum speed	120 km/h
Acceleration	2.0 km/h/s
Deceleration	3.3 km/h/s (emergency brake)
Gauge	1,067 mm
Voltage	1,500 V DC overhead
Braking system	Regenerative brake
Safety systems	ATS-P, ATS-SN, ATC

The E217 series (E217系電車) EMU was the first outer-suburban train type with four doors per side on car. It was introduced by East Japan Railway Company (JR East) in 1994 to replace the 113 series EMUs running on Sōbu Line (Rapid) and Yokosuka Line. The cab design is unique, but the basic design was developed from the 209 series commuter EMUs. It replaced all the Yokosuka Line 113 series trains by 1999.

In March 2006, three 15-car trains were reformed as 10+5-car sets and transferred to Kōzu depot for use on Tōkaidō Main Line duties out of Tokyo alongside E231 series trains. The sets were repainted into the same Shōnan color scheme of orange and green bodyside stripes as applied to the E231s.