Simplify the following text for a Grade 10 native English-speaking person.
Original: Class 395 is the designation of new dual-voltage EMUs being built to operate new high speed domestic services on the High Speed 1 railway line in the United Kingdom .
Simplified: British Rail Class 395 is a dual-voltage electric multiple unit ( EMU ) used by train operating company Southeastern for its services along High Speed 1 and onwards to the Kent coast . The trains were built in Japan by Hitachi and shipped to the United Kingdom to operate new high speed domestic services .