V/Line's latest punctuality figures show 91.3 per cent of April services arrived at their destination on time.

The result is nearly a 10 per cent boost from the month before and is the best result since back in April 2018.

It comes after trains were replaced with road coaches for two weeks.

A V/Line spokesman said the $6 million package of track, station and structure improvement works provided "a smoother ride for Warrnambool passengers and reduced the number of speed restrictions on the line".

"Additional time was placed into schedules directly after the improvement works took place on the line, providing passengers with more certainty around journey times while new track bedded down," he said.

"This time was taken out of the schedule once the track was ready for trains to run at normal speeds." And while the April figure is a welcome improvement, it still falls short of V/Line's punctuality target of 92 per cent.

The spokesman said the main reasons for delays included trains stopping longer than scheduled in the timetable and the temporary speed restrictions that were in place earlier in the month before improvement works were completed.

Those restrictions have since been removed.

The spokesman said 138 services operated on the line last month, 12 of which were delayed by more than 10 minutes.

The monthly performance figures also show 92 per cent of services arrived on time on the combined Geelong and Warrnambool lines.

That figure was the highest result for April since back in 2014.

"April's performance results are closer to the level of punctuality our south-west passengers deserve and expect," the spokesman said.

"We thank our passengers for their patience while coaches replaced trains during April as we got on with the essential maintenance works that will ultimately make everyone's journey more reliable."