Just on the cost side of things, if you are from north roaming down here, o2 Ireland have a pretty good prepaid offer now which should work in the broadband modems.
Its 1 cent per kb up to 99kb, therefore 99 cents, and free thereafter up to 50 MB per day. Might be cheaper just to pick up a free/cheap prepaid sim while you are down south.
On the technicalites of it, well it all depends.
A slow moving train in an urban area will do well, whereas a fast moving train has potential to drop out as you handover more often from mast to mast.
In the countryside, provided the signal is good, a fast moving train should be ok.
Going back a few years now, there was a problem with one of the networks where almost every hour, two masts somehere in Co. Tipperary would fall over for a few minutes.
After some investigation, they came to the conclusion that it was because of the then new hourly service between Cork and Dublin. The cause was because two trains passed each other at a point where a handover was taking place.
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