A five-year-old slipped away from his mom, boarded a train and rode through 34 stations before transit workers found him.

The Bronx boy got on a downtown No. 1 train at the Marble Hill subway station shortly before 8 a.m. Monday, riding it 13 miles to South Ferry, the end of the line, where two transit workers found him, the New York Post reported.

As finance ministers and central bank heads from 19 nations and the European Union, along with U.S. President Barack Obama and other world leaders, meet Wednesday in London for the Group of Twenty (G20) summit, thousands of protestors are gathering to demonstrate over a variety of issues.

About 5,500 police officers are also there to keep order and police have reportedly shut the entrances of some subway stations in an effort to control crowds.

A federal court Sunday stopped MIT students from demonstrating how to subvert Boston's subway payment system after the Massachusetts transit authority Friday said such information would "inflict serious damage."

In a scheduled slide presentation to be shown at the Defcon hacker conference in Las Vegas, three students outlined how Boston's CharlieCard and CharlieTicket subway payment systems could be subverted, including creating passenger cards, duplicating magnetic strips and interfering with wireless card readers.

Boston's rail commuters gave mixed reviews on the new seats of the Metro Boston Transit Authority's Blue Line cars. Some riders complained the new seats were too slippery, while others appreciated the wider space it offers.

The new seats is made of fiberglass with a shape not fitting the human spine. The old model had soft vinyl seats, but narrower by 2 inches. Hence, only 35 passengers could sit per row in the new car compared to 42 riders before, regular commuters told the Boston Globe.

Riders of the London Underground will hold cocktail parties inside rear cars of subway lines at 9 p.m. on Saturday to mark the end of Britons' drinking tradition on public transports.

Drinking, and drunkenness, will be banned on trains and buses starting June 1 for a safer and more pleasant travel, a regulation introduced by new London Mayor Boris Johnson on May 7.