Commuters on the busy Cranbourne and Pakenham lines are suffering the city’s worst train delays, as Metro Trains struggles to meet its beefed-up punctuality target.

Metro Trains has met its monthly punctuality target just six times in the past 12 months, yet the train operator has received $6 million in taxpayer-funded bonuses.

Metro Trains met its punctuality target only six times in the past 12 months. Credit:Simon Schluter

Similarly, Yarra Trams was awarded $1.26 million in bonuses, although it failed to meet its monthly on-time performance target five times.

The performance data was released a day before Melbourne hits 42-degree heat, with Public Transport Victoria chief executive Jeroen Weimar assuring commuters that services would not melt down.