CWR is one quarter mile long. It is heated when put
in place. The heating somehow prevents physical
problems?
--- Bob Campbell <amtrak347@aol.com> wrote:
> --- In CBQ@yahoogroups.com, "Dale Reeves"
> <drale99@...> wrote:
> >
> > Hi Ted:
>
> > One question I have never had answered is this:
> How is long,
> continuous
> > welded rail possible? I would think thermal
> expansion and
> contraction would
> > buckle the rail and wreak havoc with the entire
> roadbed
> construction.
>
> I have
> > also been curious about how you avoid problems on
> curves due to
> tension in
> > the train.
>
> Dale Reeves
>
> Dale -
>
> "Rail Creep" is pretty well controlled by the
> installation of "rail
> anchors" on both sides of the crosstie under the
> rail. So long as
> the anchor is kept "snug" up against the "tie",
> creep is kept to a
> minimum. Poor "anchoring" leads to "pull aparts" in
> the winter
> and "sun kinks" in the summer. Heavy ballasting on
> the outside of
> curves keeps the track in place. "Stringlining" a
> train on a curve
> takes in a lot of factors, such as tonnage, grade,
> HPT, track
> geometry, etc.
>
> Bob Campbell
>
>
>
>
>
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