[Avodah] pikuach nefesh

[Poppers, Michael]

In Avodah V28n87, RET noted:
> CI has a question: Can one divert a grenade to save many people but it will fall on a few. CI remains with a safek. R. Zilberstein in many shiurim seems to tend towards allowing it (it has many practical applications). I believe the Tzitz Eliezer does not allow based on the CI' safek <
Isn't that question the "trolley problem"* (for which I was told some years ago the Halachic answer is "no, don't throw the switch")?
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*) http://en.wikipedia.org/wiki/Trolley_problem

All the best from 
-- Michael Poppers via BB pager