Two men pushed a woman onto railway tracks after she told them to stop smoking, police have said.
The woman, 58, suffered a broken wrist and bruises to her legs at Farningham Road station in Kent but officers said she was lucky to be alive.
She landed inches away from the live third rail, which carries 750 volts.
Det Insp Bob Richardson said it appeared the woman had spoken to the two men about smoking earlier in the week.
He said the woman walked along the London-bound platform and was pushed onto the line as she passed the men at 0700 BST on Wednesday.
"This is clearly a serious situation and our concern is for the woman at this time"
The woman was taken to hospital and released after treatment, he added.
Det Insp Richardson said: "The woman was very lucky she was not more seriously injured."
Police were looking into a number of leads and were viewing CCTV from the station, he said.
A statement from rail operator Southeastern said: "This is clearly a serious situation and our concern is for the woman at this time."
Fellow commuters pulled the woman from the tracks.
Train services between Kent and London were disrupted during the morning rush hour because the power had to be turned off.
One of the men was described as white, in his mid 20s, and about 6ft, with a stocky build. He had short cropped brown hair and was wearing beige shorts, a green round-necked T-shirt and trainers.
The other man was white and in his early 20s with a medium build, bright red shorts and a dark top.
Officers are trying to establish what the men did after the attack.
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