East of Strathfield, the majority of the bus network replaces the city's former tram network. State Transit operates a network tightly integrated with train and ferry services in the Eastern, Northern and North-Western regions of Sydney. In other areas services are operated by private-sector companies under contract to the NSW Government authority Transport for NSW. Under pressure from bus contracting reforms, many of the private bus companies have merged or entered into joint ventures. The largest private bus operator is ComfortDelGro Australia, owners of Hillsbus and Forest Coach Lines. Other significant players include Punchbowl Bus Company, Busways, Transdev NSW and Transit Systems