Rail passengers are being asked if they recognise a man following a alleged flashing incident on a Northern train.Advertisement
The incident took place around 7pm on a Northern rail service between Preston and Lytham St Annes.
A 50-year-old woman boarded the train at Preston on Thursday 10 May.
A man sat in front of her and exposed himself in front of other passengers.
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The victim alighted the train at Lytham and informed station staff but the man had gone.
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British Transport Police have released CCTV pictures of a man they wish to speak to.
Anyone with information is asked to call police on 0800405040 or text 61016 quoting log reference 595 of 10 May.