Simplify the following text for a Grade 7 native English-speaking person.
Original: This remained the case until 1949 , when the London Transport Passenger Board 's New Works scheme extended the Central Line to Epping using electric trains ( taking over the railway from British Rail ) .
Simplified: At this time the London Passenger Transport Board 's New Works project extended the Central line to Epping using electric trains . The Central Line would take over the railway from British Rail .