Public transport services are poorly co-ordinated, the Auditor-General has found, with little progress on improving public transport across Victoria despite repeated promises from state governments over the last decade.

In a report tabled on Wednesday morning, Auditor-General John Doyle finds that progress on improving public transport co-ordination has been slow, despite initiatives featuring prominently in statewide strategic land use and transport plans for many years.

Over the decade of these plans' release, public transport has been managed as a collection of separate modes rather than as an integrated system.

Former premier Ted Baillieu was elected in 2010 on a promise to copy "some of the most successful public transport systems in the world," such as "London, Zurich, Vancouver, Toronto" with the creation of a new transport coordinating authority.

But Mr Doyle found that the body his government created, Public Transport Victoria, must "do more to achieve adequate co-ordination".

Public Transport Victoria’s establishment and focus on improving public transport services was a key development, the report finds, and the authority has "improved its understanding of the challenges and actions needed to improve co-ordination".

But the authority must do better at finalising its co-ordination plans for buses, trams and rural and regional public transport services, and check more accurately if services actually run on time.