The plan? To change passengers’ behaviors and get them to stand side by side riding — not walking — during peak periods.

The Underground had concluded that in stations with escalators taller than 18.5 meters, or about 61 feet, much of the left side went unused, causing blockages and lines at the bottom. The Underground campaigned to fill the available space on the escalators with people, rather than leaving the left side of each step largely empty, except for those who chose to hike up.

An experiment in 2015 at the station found that standing on both sides of an escalator reduced congestion by about 30 percent.

Consultants at Capgemini Consulting in London explored the efficiency question by timing themselves over several days walking and standing on an escalator at the Green Park station and then using that data in computer models.

They found that walking up the escalator took 26 seconds compared with standing, which took 40 seconds. However, the “time in system” — or how long it took to stand in line to reach an escalator then ride it — dropped sharply when everyone stood, according to a blog post by the researchers.

When 40 percent of the people walked, the average time for standers was 138 seconds and 46 seconds for walkers, according to their calculations. When everyone stood, the average time fell to 59 seconds. For walkers, that meant losing 13 seconds but for standers, it was a 79-second improvement.

Researchers also found the length of the line to reach and step onto an escalator dropped to 24 people from 73.