Rail Performance

It has recently been brought to my attention that in Great Western Railway, which serves my constituency in Devon, drivers do not have contracts that ensure a seven-day-a-week service—the contracts do not include Sundays, so trains are regularly cancelled. In fact, four trains were cancelled yesterday, so one lady had been forced to catch the first train today instead. What plans does the Secretary of State have to equalise driver contracts under Great British Railways, to ensure that routes such as Paddington to Devon are fully staffed seven days a week, so that she can fulfil her promise to passengers?