Thousands of migrants riding atop railway cars in Mexico this week or waiting in mile-long lines by the tracks to hitch a ride to the U.S. have triggered the closure of one U.S. border crossing and forced Mexico’s largest railroad to suspend dozens of freight trains.
But the upsurge has also revealed a much larger phenomenon — an almost unbroken chain of migrants being shuffled from Colombia through the Darien Gap jungle into Panama on an industrial scale that could approach 500,000 this year.
