The SA ALP will be quite happy with this move by the Liberal government. They are just like their corrupt mates in Victoria - the only thing they love more than selling off public assets themselves is when the Liberals do the job for them.
Then they next get into government, you can bet that they will find some excuse to go back on this pledge and stick with private operations.
Look at the form of the last ALP government in SA with respect to public transport services.
At the time they came into power in 2002, they inherited a partially privatised bus network (3 out of 6 service regions) where a minimum level of competition was ensured by having the public sector company TransAdelaide enter a bid for each tender.
While they were in power, the Rann/Weatherill government took the following steps to advance the private operation of the public transport network:
1. privatised the remaining 3 bus regions
2. abolished TransAdelaide's role as the public sector bidder
3. extended private operation of each bus region when contracts expired