A woman aged in her 60s has been rushed to hospital after a fight on the Sunbury train line.
Paramedics picked up the woman at Middle Footscray station shortly before 1.30pm, and have taken her to the Western Hospital in Footscray with upper-body injuries.
An ambulance spokesman said the woman was in a stable condition.
Metro Trains spokeswoman Larisa Tait said passengers on the Sunbury line had experienced 40-minute delays around 2pm due to the police incident.
But the delays were reduced to 10 minutes by 3pm, she said.