Simplify the following text for a Grade 6 native English-speaking person.
Original: The Epping Ongar Railway operates on a preserved railway along the final section of the old Great Eastern Railway and London Underground Central Line branch line between Epping and Ongar , with an intermediate station at North Weald .
Simplified: The Epping Ongar Railway is a preserved railway . It runs along the last section of the old Great Eastern Railway and London Underground Central line branch line .