The service could have been disrupted, and the controller may have
decided to run one, either to get a train back to time or if Olympia
has had a long interval without a train. I've known Circles to be
reformed into Hammersmith's en route before now

If Olympia had a long interval without train there would have had to be a SERIOUS disruption, since the service is
run with 2 trains running with 15-18 minutes between. (So a complete round takes 30-36 minutes for that short
stretch)

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Lars Elmvang
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Min mailadresse finder du ved kun at skrive det overeksponerede domænenavn én gang