The teenager was travelling on a Great Western Railway service between Newquay and Plymouth when she was approached by a man in a novelty shark hat who offered to help her with her luggage.
When on the train, he sat next to her and then asked if she wanted a kiss.After she said no, the man started tickling her and attempted to take her phone. The girl then moved to a different seat.
She was approached by another man who she told what had just happened,Daily Mail reports.
The man, who said his name was Lance, then sexually assaulted her by kissing her and touching her and himself inappropriately.
The terrifying incident took place between 8.45pm and 9pm on August 12.
British Transport Police are now appealing for witnesses who could provide them with information.
Investigating officer Detective Constable Matt Grieve said: 'This was a deeply upsetting and shocking incident for this young woman.
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