how do trains turn in a tight tunnel without derailing?
In: Physics
The same way they turn on normal track. The tunnel is wide enough to accommodate the length of the train car.
If a tunnel is narrow enough, there are restrictions on how long a train car can be to go through the tunnel. Most cars do not need such restriction. Height is a much more common restriction.
Only something like a wind turbine would be long enough to have such a restriction, and they have crews constantly monitoring it throughout the journey
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