In 1987, JNR was privatized, divided in seven railway companies, six for passenger service and one for freight, collectively called the Japan Railways Group or JR Group. After that moment, each company developed it own trains, a process that led to a lot of innovation and the appearance of a wide variety of trains.
Photographed here in Tokyo Station, are the "noses" of two of the most modern Shinkansen trains operated by JR East. The green one is an E5 Series (built since 2009) running on the Hayabusa service, coupled with a red E6 Series (2010) which runs on the Super Komachi service. In the background is an older model, an E2 Series, produced between 1995 and 2010.
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 24mm
Aperture: F/5.6
Shutter Speed: 1/250s
ISO Sensitivity: ISO 1800