Are there subway lines that connect cities in different countries?
by 
Egao No Genki
ANSWERS: 1
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The Channel Tunnel, (French: le tunnel sous la Manche; often nicknamed the Chunnel in English) is a rail tunnel beneath the English Channel at the Straits of Dover, connecting Cheriton in Kent, England and Sangatte in northern France. A long-standing and hugely expensive project that saw several false starts, it was finally completed in 1994. It is the second longest rail tunnel in the world, surpassed only by the Seikan Tunnel in Japan. It is operated by Eurotunnel plc. en.wikipedia.org/wiki/Channel_Tunnel For underwater subways (trains), The Channel Tunnel is the answer to your question.
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