Specifically how do they cut the train’s station wifi’s connectivity once I am in the train and the train’s wifi’s network offers me to connect inside the train?
In: Technology
The train is a metal box. Any decently programmed OS will prefer to use the stronger signal, and the one that needs to go through a metal box won’t be it.
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Usually, when the train or even some supermarkets have a layer of metal act like a Faraday cage, keeping any electricity or waves inside/outside.
It works both ways!
That is why you might have issues in supermarkets like lidl/kaufland/carrefour and so on.
The train car is a big metal box. A big Faraday cage.
Faraday cages are very good at blocking the radio waves used by wifi.
Put your phone in the microwave (DO NOT TURN THE MICROWAVE ON) and you will find that also blocks the wifi signal.
That’s how the microwave oven keeps the microwave radiation inside.
Short answer wifi device prefers a better signal. the long answer is wifi Roaming. It’s how you can go to a big box store like Walmart and don’t notice a disconnect when you move across the store all the access points can hand off your device to another access point without any noticeable cut in service
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