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When the Simplon Tunnel opened it was the only permanent road access between which two countries?

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When the Simplon Tunnel opened it was the only permanent road access between which two countries?
posted Dec 6, 2022 by Anil Chaurasiya

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Italy and Switzerland
The first of its two single-track tunnels was opened in 1906, and is 19,803 m (64,970 ft) long. The second, 19,824 m (65,039 ft) long, was opened in 1921. For much of the 20th century the tunnel was the longest railway tunnel in the world.

answer Dec 7, 2022 by Mohammad
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