A South Korean soldier takes a position as a woman passes ticket barrier during an anti-terror and security drill at a subway station in Seoul April 15, 2013. North Korea celebrated the 101st anniversary of its founder's birth with flowers on Monday, although there was no sign of tension easing as South Korea warned that the North's survival could be in question without change and development. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY) 

A child waits with her mother in an overcrowded line to collect train tickets ahead of the Eid al-Fitr festival in Kamlapur Railway Station in Dhaka August 5, 2012. According to local media, Bangladesh Railway authorities began selling tickets of different routes to facilitate the journey of thousands of homebound people ahead of the Eid al-Fitr festival, arranging over a dozen special trains. REUTERS/Andrew Biraj (BANGLADESH - Tags: RELIGION TRANSPORT) 

The Columbus Circle Subway Station is deserted after the Transit Workers Union Executive Board voted to reject the MTA's final offer and declare a strike effective immediately, shutting down all bus and subway service in New York City, December 20, 2005. New York transit workers walked off the job for the first time in 25 years on Tuesday, stranding millions of people who rely on the largest U.S. bus and subway system each day. REUTERS/Peter Foley 

Closed turnstiles sit idle at the Times Square subway station in New York December 20, 2005. New York transit workers walked off the job for the first time in 25 years, stranding millions of people who rely on the bus and subway system each day. REUTERS/Brendan McDermid 

The gate of the entrance to the Times Square subway station in New York is locked December 20, 2005. New York transit workers walked off the job for the first time in 25 years, leaving millions of people who rely on the bus and subway system each day stranded. REUTERS/Brendan McDermid Pictures of the Month December 2005