Simplify the following text for a Grade 8 native English-speaking person.
Original: They were not ` built ' as such but rather re-formed from Class 201 and EPB vehicles for use on Reading-Redhill-Tonbridge ( North Downs Line ) services .
Simplified: They were not ` built ' as such but rather re-formed from Class 201 and EPB vehicles for use on -- ( North Downs Line ) services .