They tend to be rectangular. They also tend to have the rows of seats up against the walls with the aisle down the middle.
If you've got a window seat you've got one wall directly beside you. So half the passangers are going to be 25cm or so away from the first wall. Admittedly if they're seated in the middle of the train the front/back ends of the carriage may be quite a way away, but the sides are always going to be pretty nearby.
Anyway, the point is that particularly where distance makes a huge difference to the dissipation, presenting an overall average makes it look like much more will have dispersed than actually will have (floors/ceilings may be interesting to consider as well).
That said, I do like the idea of mobile phone free carriages, though they don't really bother me much since most of the train trips I take are intercity and hence tend to have reasonable stretches where there is just no mobile phone reception (so things tend to be concentrated around the train stations, which are where more people start talking/moving around anyway, so it's not significant).
But loud talking in general gets annoying on train trips. Normally if you talk to someone on the train they sit right next to you and so you speak with a somewhat lower voice than normal. People on mobiles however generally speak atleast at normal, often louder if the reception is dubious. If you're trying to nap, then the small difference can be enough to make you irritable about it (particularly if it is an overnighter and most of the others have already ceased their conversations with each other).
However I doubt that there is significant increase in radiation on trains, could see it doubling or so, but that just makes the minor dangers a tiny bit less minor.
Within 3 foot of you on a train are atleast five other people (if it's full - person beside you, two infront and two behind, not sure whether to count people in the far aisle or not).
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