The Washington Metropolitan Area Transit Authority (WMATA) says it had its second-busiest traffic day ever for Saturday's Women's March on Washington, with 1,001,616 rides on the capital's subway system.

Metrorail ridership for Sat, Jan 21 = 1,001,616 #wmata — Metro (@wmata) January 22, 2017

WMATA's busiest day was in 2009, when former President Barack Obama Barack Hussein ObamaThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon Trump appointees stymie recommendations to boost minority voting: report Obama's first presidential memoir, 'A Promised Land,' set for November release MORE's inauguration drew 1.1 million rides.

Social media was flooded on Saturday with photos of women arriving in D.C. for the Women's March on Washington, with Metro stations and streets flooded with participants. The Associated Press estimated 500,000 demonstrators attended.

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Metro said it saw higher ridership for the march than for President Trump's inauguration one day before.

As of 11 a.m. on Saturday, about 275,000 trips had been taken on the mass-transit system, compared to about 193,000 the day before, WMATA tweeted.

In fact, Trump’s inauguration drew a smaller crowd to the Metro than the past three presidential swearing-in ceremonies. In 2013, former President Barack Obama’s second inaugural event registered 317,000 trips by 11 a.m.

Obama’s first inauguration in 2009 drew even more — about 513,000. And in 2005, WMATA counted about 197,000 trips for former President George W. Bush's second inauguration.