Amid slowing demand for the shot, authorities in Berlin offered a special train service today for anyone interested in getting vaccinated against the coronavirus.

The service operated on a circular commuter line that runs around the centre of the German capital for two hours, according to AP.

Officials invited anyone aged 18 or older to step aboard and receive a dose of the one-shot Johnson & Johnson vaccine. Slightly more than 60 per cent of the German population is fully vaccinated against Covid-19, while infection rates are rising strongly again.