http://news.bbc.co.uk/1/hi/uk/6448327.stm
An extra 1,000 train carriages are expected to be provided for Britain's railways in a bid to tackle overcrowding, the BBC has learnt.
Ministers will announce that carriages will be used to lengthen trains on the most congested parts of the network.
Much of the extra rolling stock is likely to be used on the jammed network serving London and south-east England, where passenger increases are highest.
It is understood the government wants them introduced by 2014.
BBC transport correspondent Tom Symonds says the carriages - equivalent to about one-tenth of the current total fleet - will be newly-built.
The government will pay for them, to be leased to the train companies at a cost of about £130 million a year, he says.
Number-one problem
As well as relieving the problems in south-east England, crowded cities in the rest of England and Wales are also expected to benefit.
Last year, there was a 10% rise in the numbers of people taking the train.
Overcrowding has rapidly become the number-one problem facing the railways.
Train companies have been making dire warnings about the future, and passengers are being told they will have to stand more often.
The government is expected to promise the new carriages on Wednesday, and later this year it will publish a wider strategy to improve the capacity of the rail network.