 Until its cessation, Westbus' services were part of Sydney Bus Regions 1 and 3.In 2012, these regions were put out to tender by Transport for NSW.Westbus' bids to retain both regions were not successful, with the Region 1 services operating out of St Marys and Windsor passing to Busways, while the Region 3 services operated by Bonnyrigg and Girraween passing to Transit Systems Sydney, both in October 2013.