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.
More top news
Three Welsh billionaires have made this year's Sunday Times Rich List, with Sir Michael Moritz topping the list for the richest in Wales.
A fine end to the weekend, with sunny spells throughout the day. Moving into the start of the week, more bright spells but feeling colder.
Off to the London Marathon today? If so, send us in your pictures.