800104 en route to Aberdeen in March 2020. ©Richard Birse
The Class 800 is a type of bi-modal multiple unit used in the United Kingdom, based on the Hitachi A-train design. The first units entered service with GWR on the Great Western Main Line (GWML) in October 2017, and entered service with LNER on the East Coast Main Line (ECML) in May 2019. These trains were assembled at the Hitachi Newton Aycliffe facility, alongside the related Class 801 & 802 units, from bodyshells shipped from the Kasado plant in Japan. The Class 800 is part of the UK Government's "Intercity Express Programme" which intends to partially replace Intercity 125 and Intercity 225 train sets in mainline usage. The Class 800s, being bi-modal, have more operational flexibility as they are capable of working on lines which have not been electrified.
(Information provided via Wikipedia)