Simon Calder, a travel journalist, says the disruption at London Paddington train station could continue into the weekend.
A number of services, including trains to and from south Wales, were cancelled after signalling problems caused major disruption to a line.
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Councils have until today to say if they plan to merge. Minister Leighton Andrews says joining together will create 'significant savings.'
Mainly cloudy, with a little patchy, light rain in the southeast this afternoon. Some brighter spells in the west at times.
A largely dry, cloudy and mild night with fog patches mainly confined to higher ground. Blustery along the coast.