There is one RS18 remaining in the Sydney yard, the prime mover and other parts have been removed, the rest of the unit is going to the Orangedale Train Museum for a static display. It will eventually be repainted in CNR green and gold as funds permit.
I also recall one other RS18 in semi servicable condition, but I am not sure of it's current location, it could have been sold or scraped, next time I am down the yard I will find out what happened to it.
All other remaining C630M's and RS18's were hauled to the Sydney Coal Railway (former DEVCO) shops, salvaged for any usable parts, which I beleave went to the US then scrapped.