"Warp" <war### [at] tagpovrayorg> wrote in message 
news:477fd1d1@news.povray.org...
> pan <pan### [at] syixcom> wrote:
>> This could only be true if the trains and the track are 
>> uncoupled.
>> They are not, so any contraction of trains will apply equally to
>> the
>> track.
>
>  Nope. The trains are moving at a different speed than the track 
> and
> thus the trains compress more.
>
> -- 
>                                                          - Warp

Train wheels gripping track exponentially gets looser
the greater the speed of the train. At c or near c the
track will have to move almost the entire speed of the
train; else the instability will overwhelm your system.

ergo: the track and train muts be coupled, else you
would be asking about trains and tracks on separate
unique vectors. (Unpredictable vectors btw)

unless of course your train wheels and track rails are
made of unobtanium held together in the grip of
stick-but-slick-enough-to-let-the-wheels-move goop.

Think dentures under a lot of strain.

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