Transit Crime Investigation Unit detectives are investigating the circumstances surrounding the death of a woman at Thomastown on Fridcay night (July 17).

Investigators believe the woman was crossing the line near the Thomastown Railway Station about 6.20pm when she was struck by a train.

The woman, who is believed to be in her 70s, died at the scene.

Anyone who witnessed the incident or with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au