Delays to First Great Western trains between South Wales and London have increased , bucking the trend for improvement among Britain's rail providers (link below.)
http://www.rmtbristol.org.uk/2006/12/first_great_westerns_intercity.html#moreWith more than one in four trains running late , FGW's InterCity service is the worst in Britain for delays , according to figures from the Office of Rail Regulation.
The ORR's figures show that only 72.7% of FGW's high-speed services were on time in July , August and September.
FGW said the figure reflected "extreme summer conditions". Britain experienced heatwaves in July , although August was much cooler.
A FGW spokesman said, "Summer 2006 saw record-breaking temperatures. These unprecedented conditions affected the railway as well as causing problems to all forms of transport, such as melted roads."
"The heat resulted in a number of rail infrastructure and technical problems, which included buckled rails amongst the technical issues."
The above link also claims that the Welsh Assembly Government is considering possible investment to upgrade infrastructure on the Cambrian Line in Mid Wales.