In central London, at rush hour, especially if tourists are present? Often. I used to travel through Holborn regularly, and simply walking through the short tun

In central London, at rush hour, especially if tourists are present? Often. I used to travel through Holborn regularly, and simply walking through the short tunnel from platform to escalator would take (what felt like) 10 minutes on bad days, with people literally packed tight. The fully standing escalators stopped that happening. Other stations have the same issue.