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A photo of a woman elegantly sipping what appears to be a glass of gin while wearing sunglasses on the Tube has gone viral, but sparked a warning from TfL bosses today.

The passenger was hailed as "classy" and a "hero" on Twitter after Mark Locke posted a picture of her sipping the cocktail on his Twitter account.

The woman was spotted travelling on the Northern line when she decided to pour herself a glass of what appeared to be pink gin from a can from M&S.

Mr Locke, from Scotland, took the snap and shared it in a post on Twitter, writing: “To the lady drinking a pink gin and tonic *from a glass* on the Northern line, I salute you. Classy."

The image quickly garnered thousands of likes and shares, with people jumping to praise the woman, calling her "glam”, a “queen” and “next level”.

But TfL today reminded passengers of the alcohol ban on public transport.

A spokesman said: “We work with our police colleagues to provide a transport service that feels safe and welcoming for everyone.

"Customers are prohibited from drinking or carrying open containers of alcohol on the London Underground, buses, Docklands Light Railway, tram services and London Overground.

"These rules play an important part in ensuring that everybody travelling on our transport network has a safe and pleasant journey."

“TfL staff, inspectors and the police deal with incidents of alcohol consumption usually through asking the passenger to refrain and dispose of the alcohol, using the opportunity to educate about the purpose of our bylaws.”

Mr Locke, a communications director for finance companies, had been in London on business for the day.

He said: “I’d had lots of meetings and was feeling pretty tired and not particularly looking forward to the trip back north.

“I was in the middle of checking some emails, so I had my phone in my hand.

“I saw the lady casually pouring the drink into a glass and instinctively took a snap as it made me smile.

“If I had a glass in my hand at the time, I would have been tempted to go over and clink it and toast her good health..”

The viral image comes after Diane Abbott was pictured drinking a can of mojito on the Overground and later apologised for breaking TfL’s alcohol ban.

Following this incident, tens of thousands of planned a "sip a cheeky can of mojito on the London Overground" event in honour of shadow home secretary Ms Abbott.