The platforms at Farringdon are so long they reach Barbican station, but they chickened out of making it a full on connected station. Instead there's an unadvertised lift that takes you from the Barbican end of the Elizabeth Line to Barbican station, so you can theoretically enter at Farringdon, walk down the Purple Platform, get up into Barbican station, take a train back to Farringdon, and re-enter the Elizabeth Line platform you started on. So I did that.

A proper video to follow.

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