Services have resumed between Caulfield and Moorabbin on the Frankston line after two separate fatalities today.

Ambulance Victoria spokeswoman Lauren Nowak said the two elderly men were found dead on arrival.

The death of the first man, believed to be aged in his 80s, is not being treated as suspicious.

His body was found near Edithvale at 1.10pm.

Victoria Police spokeswoman Nicole Poynton said police were investigating the second man's death, which happened about 4pm near McKinnon station.