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@Greenbank
It's to do with the shape of the tunnels. This is their reasoning, not mine:-
Deep underground tunnels are oval shaped close to profile of the train. In an emergency you walk to the either end of the train to get off it. Bikes aren't allowed on these sections because they could get in the way of people walking down the length of the train.
On the not-so-deep underground or overground sections the emergency exit route is through the normal doors onto the tracks, bikes won't get in the way of people in the same way.