:roll: late comer tothe trip and am trying to organise how to get from Sydney Airport to Katoomba.
Then as I am only ther for the first week how to get from Cassilis back to Sydney?
From Sydney airport, you can catch a train to the city (i.e. "Central" station). Then you can catch an "Intercity" train from Central station to Katoomba (if you want to have a look around there) or Lithgow (if you want to go directly to where the ride starts from. That's what my parents are doing on Friday 28th after flying up to Sydney.
If you want to know the train timetables, go to the CityRail website
As for getting back after the ride ... doesn't the first 8 days of the ride finish in Scone not Cassilis?
If so, you'd be able to catch a CountryLink train from Scone back to Sydney. I'd suggest you book that pronto though - because only 3 boxed bikes fit on the CountryLink trains.
CountryLink home here
and Countrylink network map here
Hopefully that helps.