Helen Duffett: Green transport?
Helen Duffett: Best. Police car. Ever
Helen Duffett: NYPD car and truck
Helen Duffett: NYPD horse
Helen Duffett: NYPD bike
Helen Duffett: Still plenty of Thames-less Tube maps left; will they become collectors' items, like Frost Fair programmes?
Helen Duffett: Paramedic bike
Helen Duffett: Station clock: Bethnal Green
Helen Duffett: Station clock: Gants Hill
Helen Duffett: Station clock: Redbridge
Helen Duffett: Gants Hill station inspired the Moscow Metro
Helen Duffett: Surprised tube face
Helen Duffett: Station clock: Hammersmith
Helen Duffett: My kind of cement lorry
Helen Duffett: At Mile End station
Helen Duffett: At Mile End station
Helen Duffett: "Putney Green" station doesn't exist!
Helen Duffett: The end of the Circle Line is nigh. It's the Circleocalypse. #circlelineparty
Helen Duffett: Ain't no party like a #circlelineparty
Helen Duffett: Joseph Cyril Bamford causes a stir at school
Helen Duffett: Micro cafe
Helen Duffett: Mini-bago