&gt; The modern trains will be equipped with WiFi and charging stations.<p>I&#x27;m a bit sceptical for the charging stations. USB ports are damn easy to break, even accidentally - e.g. by forcefully inserting a USB connector the &quot;wrong&quot; way, breaking off the inner lid and likely shorting Vcc to GND in the process. Also they wear out pretty fast... not to mention people getting pushed around in a crowded car, and breaking off cables out of the ports with their elbows.<p>Providing &quot;live&quot; 220V, on the other hand, also has safety issues. In a mass transit situation there will be &quot;pranksters&quot; who set off the RCDs with &quot;tweaked&quot; plugs (used to do this in school for great effect), there will be people who connect shady equipment to the outlets etc., or just people with fried chargers providing a fire hazard.