Great Western Railway passengers are being told to expect disruption today as there are not as many staff in work as normal, which the operator says is down to a number of reasons.
It's running a revised schedule, as it says on-going engineering work, the sunny weather and even the World Cup final are affecting its services.
Passengers are being advised to travel earlier or later than planned, depending on their original arrangements.
Ticket restrictions have been lifted, but the operator is warning that services are likely to be busy, as not as many will be running as normal.
However, we have been told local stopping services in some areas will operate as normal.
GWR Managing Director Mark Hopwood said:
“We will have managers and volunteers throughout our network to help at stations and on board, but unfortunately we will not be able to deliver our planned timetable of services; and the trains we are able to operate will be extremely busy.
“I would encourage customers to travel on a different day if they are able to and we will happily offer refunds to those who choose not to travel.
“We are very sorry for the inconvenience this disruption will cause.”
Train companies in other parts of the UK are facing similar problems too.
Northern's cancelled 170 services - saying it's because many of its staff made themselves unavailable.
They don't have to work Sundays as long as they give at least 7 days' notice.
The worst affected areas there are likely to be Cheshire, Lancashire and Greater Manchester.