"CJG Now Thankfully Living In The North" wrote in
message om...

Taking this example of the ice on Farrigdon platform. Have you ever
heard of rock salt?

Part of the wonders of PPP is the fact that the infrastructure companies are
responsible for providing such things as rock-salt.

In general, it is far more sensible to carry out a controlled evacuation
when there is no immediate threat to injury and then re-open those parts of
the station unaffected once controls are introduced. However, controlled
evacuations require sufficent staff to carry this out, rather than mininum
numbers of staff.