London got a new bit of Overground track today. One of the knock-on effects is that the city's transport maps must be updated to reflect the new reality. Unfortunately, TfL failed to get their newest map proofread. Can you spot the small error in the key to lines (and it's not the missing Bakerloo, that's just the way we cropped it)?
It's very nitpicky, but we know you like that sort of thing.
With thanks to keen-eyed reader Peter Bjork for the tip.