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I have a question.

There is a Underground station (In a tunnel) with a very smal islandl platform. Wich station is that, and on wich line?

I hope someone here knows.

Clapham North and Clapham Common both have narrow island platforms in tunnels.

Is that what you mean?

I don't have photo's from there, but it are probably the stations I was looking for. Should visit them in my next London midweek.