Simplify the following text for a Grade 7 native English-speaking person.
Original: It is 4 km ( 2 Â 1\/2 miles ) north east of London Liverpool Street on the West Anglia route , part of the Lea Valley Lines .
Simplified: It is 4 km ( 2 Â 1\/2 miles ) north east of London Liverpool Street on the West Anglia route .