Police are hunting a man who stole £100 from a woman seconds after she dropped the cash at Sheffield train station.
The woman had just opened her purse to use a change machine when the notes fell onto the ground at 1.30pm on Saturday, December 27.
Investigating officer PC Mark Mason said: “Before she was able to pick up the money a man quickly took it and made off towards the taxi rank.”
The thief was of mixed race, around 6ft tall and was wearing a checked shirt, jumper and blue jeans.
Anyone with information should call British Transport Police on 0800 405040.