"Snow enters the ventilation system and short-circuits the electrical traction motors for locomotives Eurostar disjonctent in a tunnel where there is high heat. The engines stop and fail to restart" .

Hm. Maybe they mean that suddenly a greater amount of (melt)water gets down to the traction motors once the snow on the cooler filters melts. Now, Eurostars have the big old-style side coolers, lots more surface for snow to stick on than the ICE1 trains crossing the Landrückentunnel every winter since 1991/2 at 250 km/h; still, something more special must have occured if Eurostar first saw such a problem only this February. However, the big refurbishment of the Eurostar fleet is only coming, so I have no obvious guess.

_{*Lunatic*, n.
One whose delusions are out of fashion.}