The woman, who sustained injuries to her shoulder, was sent to the hospital for treatment while conscious.

Police arrested the man for assault occasioning actual bodily harm at Ching Chung station after receiving the report at 4.41pm on Sunday.

According to CCTV footage circulating online, the woman wearing a light-colored top was walking across the station’s platform at the time.

As she walked past a black-clad man, the man pushed her off the platform.

The woman, who fell onto the railway track, managed to get up on her own.

When police arrived at the scene, the man had already fled.

At 7 pm, staff of the Ping Shan Stop station found the man board a Tuen Mun Pier-bound train No 615 at the station, alerting the train's captain and the police.

Later, police arrested the man at Ching Chung station.

Police are investigating the man's motivation for the assault.