Chongjin is the only city in North Korea other than Pyongyang to operate a tram system.
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The Wonson-Rason Railway and Chongjin-Rason Railway (Pyongra Line) electric railways connect Rason and capital Pyongyang.
Demick interviewed more than 100 defectors and chose to focus on Chongjin because it is likely to be more representative than the capital Pyongyang.