Unusual goods (NSW)

["Scott Beecham" <snoa@ezeelynx.com.au>]

While waiting for a train at Blacktown station this afternoon I saw what I
think is rather unusual goods. Among the usual containers etc there were
very large pieces of solid stone, strapped to a low bed carriage. I didn't
get the number of the single engine that was pulling the train but it went
past Blacktown station at around 5 pm heading towards Sydney?. My questions:
What were the huge stones and where might they have come from? and lastly
I'm a tad new to this train thing so excuse my incorrect wording.