In message , at
17:12:03 on Wed, 21 Feb 2007, Ben remarked:
In the past I have speculated that such a passage exists between the
palace grounds and Hyde Park Corner station. It is pure speculation,
based on the proximity (and the fact that no other stations are
anywhere near as close).

Wouldn't such a thing be common knowledge among the maintenance people
who walk the line, or are they well trained in not noticing things.

It wouldn't come out on the line, but behind some anonymous looking door
deep within the station. It could even be a storage room with another
door at the back, which few people working there enquire about.
--
Roland Perry