Comment by hdgvhicv

You thought wrong, the names are just a branding thing.

The overground came under TfL management in 2007, before then it was silverlink. The routes had unofficial names (north London line, Watford dc, goblin etc), they’ve had swanky new names now and the old names weren’t used officially very much, but were on the most part obvious (goblin being the Gospel Oak to Barking LINe, the rest being more obvious)