V/Line's latest performance figures show 92.5 per cent of Warrnambool line services arrived at their destination on time in June.

A V/Line spokesman said it was the best outcome in more than a year.

"Warrnambool line performance has been trending upwards since the completion of our major sleeper replacement program in late 2018, while the 12-month average for reliability is 98.8 per cent," he said.

"We're carrying more passengers and delivering more services than ever before on the Warrnambool line. This result is a reflection the hard work by our staff to improve performance and provide a better experience for our passengers."

The main reasons for last month's delays on the line included trespassers, extended dwell times at stations for passengers to board and alight trains and infrastructure faults.

The spokesman said on-time performance was heavily influenced by events on the Geelong corridor.

A major track fault at Marshall on June 24 delayed services on the line, impacting punctuality.

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The spokesman said that following the significant impact trespassers and extended dwell times at stations was having on performance in the first half of the month, a focus was placed on boarding and alighting on the line.

He said staff added additional announcements and trialled a barrier at Tarneit to assist in spreading passengers along the train in a bid to change passenger behaviour and minimise delays.

The June performance was a 5.3 per cent jump from the month before but was the only time the service exceeded its monthly target in the last financial year and the best performance recorded on the line since April 2018.

Before that, the target had not been reached since October 2011.

There has only been 12 times in the past decade where the service has seen more than 92 per cent of trains run on-time.

The V/Line spokesman said performance was affected in 2018 due to sleeper replacement works.

Meanwhile, reliability on the Warrnambool line was 98.2 per cent in June, above the monthly target of 96 per cent.

The service hit that target eight times in the last financial year, with more than 2400 services delivered between Warrnambool and Southern Cross during that time.

The best reliability result was recorded in October, with 100 per cent of services delivered but only 81.8 per cent on-time.

The following month recorded the worst result for the 12-month period, with just 62.7 per cent of trains arriving in a timely fashion.

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