Re: [NSW] A few more questions...

["Tezza" <tezza2000@dingoblue.net.au>]

"David Bennetts" <davibenn@ozemail.com.au> wrote in message
news:uJ%I6.1650$ZJ.60978@ozemail.com.au...
| "Jonathan Boles" <jaboles@bigpond.com> wrote in message

| > * I overheard someone on the train say that the reason tunnels are so
dirty
| > is the black asbestos dust from train brakes. Is this true?
|
| Tunnels build up an accumulation of filth from so many sources, not the
| least of which would be soot from diesel and steam trains passing through.
| As you say, brake dust would be a component.  If you're talking about the
| Sydney underground, train brake blocks did include asbestos, probably huge
| amounts of it were expelled by trains descending from the Harbour Bridge
to
| Wynyard, most of the braking took place in the tunnel after

| a headlong rush over the Bridge.

At 40kmh?