If the trains areheading out of London they are labelled "inbound", i.e. Baker Street to Wembley. If the trains are heading into central London i.e. Uxbridge to King's Cross, they are labelled as "outbound". However, there are some trains where this "direction" is not listed at all. This is noticeable, for example, on trains going into London along the Uxbridge branch of the Piccadilly line. Can anyone explain why this may be?
The less-clueful person here asks- wouldn't it make more sense to label them with cardinal direction of travel (I thought they were)? Or is this a legacy of the original lines? (I still have trouble with the up/down directions of lines.)