The Crossrail discussions have drawn attention to this, but it isn't really a matter for any of those threads.
It seems to be asserted that Cross/Liz/Purp is a different sort of animal from Thameslink, as well as from London Overground and Underground. To my mind however Thameslink and Crossrail have the same function and character, in that they are both through routes across central London linking together various outer-suburban routes north and south, east and west. The only difference, apart from the obvious newness and technological glitz of the latter, is that one is firmly part of the National Rail network and the other is TfL managed. They are both the London equivalent of the Paris RER. Therefore it seems to me that they should both be part of the same fares structure (are they or aren't they?), and either both or neither appear on the Tube Map (both surely).
The Underground network has its own character, but also contains an anomaly: the Metropolitan line, apart from the stretch it shares with the Circle, is much more comparable with London Overground or even most Network Rail suburban services. That is a historical accident.
It doesn't matter who owns or runs them but they ought to be treated as an integrated system and operated and marketed as such.
It seems to be asserted that Cross/Liz/Purp is a different sort of animal from Thameslink, as well as from London Overground and Underground. To my mind however Thameslink and Crossrail have the same function and character, in that they are both through routes across central London linking together various outer-suburban routes north and south, east and west. The only difference, apart from the obvious newness and technological glitz of the latter, is that one is firmly part of the National Rail network and the other is TfL managed. They are both the London equivalent of the Paris RER. Therefore it seems to me that they should both be part of the same fares structure (are they or aren't they?), and either both or neither appear on the Tube Map (both surely).
The Underground network has its own character, but also contains an anomaly: the Metropolitan line, apart from the stretch it shares with the Circle, is much more comparable with London Overground or even most Network Rail suburban services. That is a historical accident.
It doesn't matter who owns or runs them but they ought to be treated as an integrated system and operated and marketed as such.