synonymouse Wrote:
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> Over the years there has been some speculation
> that BART elevateds would require a rebuild if
> structurally stronger and presumably heavier cars
> were indicated.
>
> I also thought there may be some greater tendency
> toward horizontal and vertical oscillation with
> rubber tyred vehicles. Tires flex some but steel
> wheels do not. So you get a longer monorail train
> and it wants to "shake, rattle, and roll"?
>
> And add on subsidence of the guideway support
> pylons and you get a thumpety-thump; certainly on
> the Seattle line. Perhaps that is not so much a
> factor on the newer monorails.
>
> Sao Paulo had a tire problem recently with their
> #15 monorail line which took some months for
> Bombardier to sort out to put the line back in
> operation.
>
> You have to wonder why Sao Paulo has not tried any
> light rail AFAIK; heavy subway, monorail and
> thousands of buses. Gigantic population and
> really substantial demand for public transport.
> Plus seems lots of recent refugees from Venezuela,
> etc. LaLa on steroids.

Over the years, there has been some speculation, as well, that you are able to pull some pretty amazing stuff, right out of your a$$...