Aye, but that is what creates the "distance from tower" problem of getting poor signal quality due to normal attenuation over distance and the larger number potential shadow/interference causing things between the tower and you.
There are a number of places where trains skip around at a goodly speed in what is probably a packed area by way of phone cells, so there will sometimes be a significant number of cell-to-cell hand-offs. Having said that, as I grew up (well, more-or-less) before mobile phones were common I'm still slightly impressed that the whole cell hand-over thing works at all mid-call at 80+mph so maybe they are not much of an issue unless the destination cell is already saturated at the time.
There are a number of places where trains skip around at a goodly speed in what is probably a packed area by way of phone cells, so there will sometimes be a significant number of cell-to-cell hand-offs. Having said that, as I grew up (well, more-or-less) before mobile phones were common I'm still slightly impressed that the whole cell hand-over thing works at all mid-call at 80+mph so maybe they are not much of an issue unless the destination cell is already saturated at the time.