When did Impossible Railways Season 2 Episode 4 air?
Impossible Railways Season 2 Episode 4 aired on March 5, 2019.


How some of our greatest railways have challenged engineering's finest minds in their efforts to conquer the planet's waterways, including a tunnel beneath the English Channel.
Direct answers for episode-level questions and details.
Impossible Railways Season 2 Episode 4 aired on March 5, 2019.
This episode runs for approximately 45 minutes.
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