Thousands of Melbourne train services were disrupted over the past year as paramedics or rail staff were called to help unwell passengers, the vast majority of whom had minor ailments due to a hangover or skipping breakfast.

On average, at least two commuters a day fell ill on Melbourne trains, causing lengthy delays on services across the network.

Until now, unwell passengers have been treated on board the train by ambulance paramedics or rail staff, when usually all the person needs is fresh air and a glass of water.

The vast majority of medical events related to people not eating breakfast, being dehydrated or suffering the effects of a big night, Victoria's chief paramedic Alan Eade said.