The footage shows the Tube worker apparently threatening to "sling" the man "under a train"
A London Underground worker who was seen yelling at an elderly passenger in a video has resigned from his job.
Transport for London said Ian Morbin, a customer service assistant, handed in his resignation over the incident at Holborn station on 15 October.
Mr Morbin has apologised but TfL said the behaviour was "unacceptable".
The video shows him calling the man "a jumped up little git" and "little girl" before apparently threatening to "sling him under the train".
The statement said: "Mr Ian Morbin, a Customer Service Assistant at Holborn Tube station, has advised London Underground that he wishes to resign for personal reasons.
"He has informed us he would like to apologise for the incident involving a passenger at Holborn Tube station on Thursday 15 October and hopes that his actions have not detracted from the professional job done by hundreds of London Underground staff every day.
"As we made clear from the moment this incident was brought to our attention this kind of behaviour is totally unacceptable and does not represent the way our staff go about their jobs helping millions of customers every day."
The incident was captured on video by businessman Jonathan McDonald, a fellow commuter at the central London station.
Describing his version of events leading up to the scene, Mr McDonald said the elderly man had got his arm stuck in the door of the train.
When the victim told the Tube worker what had happened, he was sworn at three times in an attempt to make him stand behind the yellow line, he said.
Mr Morbin can be heard threatening to call the police to deal with the passenger, who is understood to have done nothing wrong.
After the footage emerged London Mayor Boris Johnson put a response on Twitter saying he was "appalled by the video".