Sydney Trains: Woman killed after she was struck down at Punchbowl Station

A woman has died after she was hit by a train in western Sydney.

The woman, aged in her fifties, was struck down at Punchbowl train station, in Sydney's south-west, on Tuesday afternoon.

She had climbed down onto the track to retrieve something she'd dropped - possibly a mobile phone - and was unable to get back onto the platform.

Emergency services rushed to the station and Fire and Rescue NSW crews worked to free the woman from beneath the train.

She was immediately transferred to an ambulance before being taken to St George Hospital, but tragically died on Wednesday morning.

Police have spoken with a number of witnesses at the scene and have reviewed CCTV as part of their inquiries.

The train driver returned a negative breath test.