Warp wrote:
>   Suppose you have two trains of the same length travelling on the same
> track on opposite directions, towards each other.
> 
>   In the middle the track splits into a double track for a certain distance,
> but this distance is slightly smaller than the length of either train.
> 
>   The task is to make the trains pass each other so that they can continue
> their journey.
> 
>   The trains cannot be split and you can't remove anything from the trains.
> The track cannot be modified, and you cannot build additional track.

Suppose your trains are being driven by brains in jars, and on each of 
the paths is a railway worker which will be inevitably killed if a train 
is set to that path...

-- 
Tim Cook
http://empyrean.digitalartsuk.com

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