Three different women were barged into by a man at London Bridge and Deptford stations.
British Transport Police (BTP) officers are investigating the incidents as a series of linked assaults.
At around 4pm on June 8 the man barged into the shoulder of a woman at Deptford station, causing her to drop her drink.
Around two hours later two other women at London Bridge were barged into in a similar manner by the same person.
Officers in the case have now released an image of a man they would like to speak to.
BTP said they believe he has information which could help with their investigation.
Anyone with information is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 461 of 8 June.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.
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