In some (maybe even most, I have not really checked) of the tunnels in the Stockholm subway there are walkable paths alongside the tracks. They or off-limits fo

In some (maybe even most, I have not really checked) of the tunnels in the Stockholm subway there are walkable paths alongside the tracks. They or off-limits for the public though. London underground tunnels are generally way more narrow than the tunnels here in Stockholm. EDIT: To illustrate this. London: https://en.wikipedia.org/wiki/File:Why_London_Underground_is_nicknamed_The_Tube.jpg https://en.wikipedia.org/wiki/File:Why_London_Underground_is... Stockholm: https://en.wikipedia.org/wiki/File:Swe_subway_switch_20050425_001.jpg https://en.wikipedia.org/wiki/File:Swe_subway_switch_2005042...