Re: New train tested at 348km/h in Italy
- From: Mxsmanic <mxsmanic@xxxxxxxxx>
- Date: Sat, 17 Sep 2005 17:48:01 +0200
Martin writes:
> We had every year we had a 3 week summer holiday in Brittany in the
> late 1980 and early 1990s. It was not uncommon for the TGV to get
> stuck when the pantograph thing came off the overhead wires. There was
> some sort of problem of waves building up in the wires when the train
> travelled at speed.
The pressure of the pantograph on the catenary produces a wave of
movement in the catenary that travels ahead of the train. Early in
the history of the TGV, it was noticed that the TGV travelled quickly
enough to catch up with this wave, which occasionally disturbed the
contact between the pantograph and the catenary or even caused the
damage (IIRC). The problem was solved by increasing the tension on
the catenary, which speeds up the wave until it moves faster than the
train.
--
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