A firm of maverick architects thinks one of London Underground's oldest tube lines should be converted into a series of moving walkways - and it might even speed things up.
The Circle Line is perceived as being the slowest and least reliable of the city's network, but the ambitious proposals claim that the conversion to three differently configured travelators would at least match current commuting times.
Artist renditions depict shops and eateries dotted around the line, with people able to simply jump off the walkway to walk on terra firma.
NBBJ has offices across the world and developed the proposals in London, it said: "The Circle Line carries 114 million people each year."
"Currently able to accommodate eight trains at any one time and reach a top speed of 20 miles per hour, the line is one of the most congested in London, often subject to delays and frequently unpleasant for overheated commuters."
The line celebrates its 110th anniversary this year.