The Piccadilly line is one of the best-used Tube lines ... A year later, a short branch opened between Holborn and the now-disused Aldwych station – but it took another two decades before ...

The Piccadilly line is one of the best-used Tube lines ... A year later, a short branch opened between Holborn and the now-disused Aldwych station – but it took another two decades before the line was ...