Friday, June 4, 1999 Published at 22:02 GMT 23:02 UK
Trains have wrong sort of roofs
The trains cut the St Pancras-Sheffield journey time - but they leak
A fleet of brand new trains is being repaired after passengers complained they were letting in rain.
The Turbo Star trains, which cost £2.5m each, have been running between London St Pancras and Sheffield for less than a week.
A spokesman from the service said: "The problem came to light on Wednesday when we had two-thirds of June's average rainfall in one day.
"The trains were doing over 100mph and some water came dripping through one of the seals.
"Unfortunately it hadn't been possible to replicate that pressure of rain with that speed in the factory, but we are now taking steps to modify the seals."
The spokesman added: "Three of the trains have already been converted and the rest of the fleet should be completed in the next few days.
"It's a shame, really, because it clouds the good news. The new fleet has cut journey times from Sheffield to London by nine minutes and has allowed us to double the number of journeys."
The blunder comes less than a week after it emerged that sliding-door commuter trains built by Derby-based Adtranz were too wide for more than 20 stations in south-east England.
Railtrack said the cost of trimming the edges of platforms to allow trains to fit would be about £1m - although Per Staehr, UK chief executive of Adtranz, said Railtrack had approved the new trains before they were built.
No-one was available from Adtranz to comment about the problems with the Turbo Star trains.