Neil Williams writes:
That's not the issue - an Underground station must be staffed for safety
reasons (in case an evacuation is required) because of being, umm,
underground.
What about the many Underground stations that are not underground, then?
--
Mark Brader | "For the stronger we our houses do build,
Toronto | The less chance we have of being killed."
| -- William McGonagall, "The Tay Bridge Disaster"