He travelled on the V/Line service between 12.52 pm and 4 pm, then spent time on Purcell St between 3.30 pm and 4.30 pm.
The man in his 20s is recovering at home. It is believed he contracted the disease in New Zealand.
The illness usually begins with common cold symptoms such as runny nose, red eyes and a cough, followed by fever and rash.
The characteristic measles rash usually begins three to seven days after the first symptoms, generally starting on the face and then spreading to the rest of the body.
Measles is a highly infectious viral disease that can cause serious illness. Those most at risk of serious illness include very young children and adults with weakened immune systems.
People can develop pneumonia and other serious complications from the disease, and often need to be hospitalised.
The advice is to ring ahead to your general practitioner or hospital if you have symptoms so that steps can be taken to avoid contact with other patients.
Victoria chief health officer Dr Brett Sutton said there were a large number of ongoing international measles outbreaks in our region — particularly New Zealand, where there have been more than 2000 cases this year — as well as the Pacific Islands, Asia, Europe and the United States.
“People who are planning overseas travel should ensure they have received vaccinations appropriate to travel, including an MMR vaccine if they do not have a history of two previous MMR vaccinations,” Dr Sutton said.
“Free MMR vaccine is now available from GPs and some pharmacies for all eligible people born during or since 1966. Patients unsure of their vaccination status or who are aged over 18 months and have only had one vaccine, should be vaccinated.”