From Aldwych on the Strand (which you can now tour, btw), to Down Street in Mayfair, many of these former stations were once part of the Piccadilly line. You can probably spot them from their red ...

Special Thanks to Transport for London More from UK Business Insider UK took a tour inside London's abandoned Aldwych Underground station. The station used to service the Piccadilly line ...

First sight of new Piccadilly line trains undergoing testing on London Underground - PICTURE EXCLUSIVE: First of 94 new trains spotted during late-night testing in west London ...