Damaged subway trains are seen at a subway station in Seoul May 2, 2014. Two subway trains collided on Friday at a station in the South Korean capital Seoul, injuring 78 passengers, the emergency ... more 
Damaged subway trains are seen at a subway station in Seoul May 2, 2014. Two subway trains collided on Friday at a station in the South Korean capital Seoul, injuring 78 passengers, the emergency services said, although none appeared to be seriously hurt. REUTERS/Park Dong-ju/Yonhap (SOUTH KOREA - Tags: TRANSPORT DISASTER) ATTENTION EDITORS - NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA less 
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Reuters | Photo By YONHAP / REUTERS
Fri, May 2, 2014 4:18 AM EDT