Simplify the following text for a Grade 9 native English-speaking person.
Original: The railway line from Queens Park to Watford Junction , currently served by London Overground , would then be served only by the Bakerloo Line .
Simplified: Between 1917 and 1982 , Bakerloo line trains continued along the DC line past Harrow & Wealdstone to Watford Junction . These stations continue to be served by London Overground .