Simplify the following text for a Grade 7 native English-speaking person.
Original: Euston railway station , also known as London Euston , is a central London railway terminus in the London Borough of Camden and is the sixth busiest rail terminal in London ( by entries and exits ) .
Simplified: Euston station is a major rail and tube station in north central London , in the London Borough of Camden . It is the seventh busiest rail terminal in London ( by entries and exits ) .