Ireland, North, Belfast, Entrance to Tesco Metro in former bank building on Royal Avenue.

India, New Delhi, Sign for the women only section oif the metro train at Ramakrishna Ashram Marg metro station.

India, New Delhi, Sign for the women only section of the metro train at Ramakrishna Ashram Marg metro station.

India, New Delhi, Metro train at Ramakrishna Ashram Marg metro station.

India, New Delhi, Metro train at Ramakrishna Ashram Marg metro station.

India, New Delhi, Metro train at Ramakrishna Ashram Marg metro station.

India, New Delhi, A no spitting sign at Chandni Chowk Metro Station.

Scotland, Glasgow, West End Hillhead Subway, Alasdair Gray mural at newly refurbished Hillhead subway with figure walking past.

Poland, Warsaw, Centrum, Modern glass entrance to metro.

Poland, Warsaw, Centrum, Palace of Culture and Science, a gift from Russia in 1955 with modern glass Metro entrance in the foreground.

Poland, Warsaw, Centrum, Modern glass entrance to metro.

USA, New York, Queens, seated subway passengers on the E Train all using their mobile cell phones but not making telephone voice calls.