Morgans wrote:

"Jennifer Howland" wrote

On some train systems, at least some of this braking energy can be
diverted
back into the catenary to power other trains. I believe even the Acela
can do
this.
Of course, you know that you are talking two totally different kinds of
train systems.

Diesel electric trains run on tracks with NO electrical pickups on wires
above, or on a third rail.

That was the type being discussed, though.

I do wonder on systems that feed electricity back onto the line, since most
are AC, I believe, how do they match phases with the current already on the
line? That would be necessary.

Well, since frequency and phase out of a mechanical generator is RPM
dependent, you would either have to have an infinite ratio transmission
or a DC generator followed by a controllable inverter.


--
Jim Pennino

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