A 25-year-old man has been arrested on suspicion of attempted murder after a passenger was pushed on to the tracks at a busy station.
They pulled the male victim back on to the platform before a train arrived and he did not suffer any serious injuries, police said.
Detectives from British Transport Police are appealing for witnesses to the attack, which happened at around 3pm on Saturday 3 February.
The force is also keen to hear from anyone who may have witnessed the "events leading up to it".
The suspect remains in custody.