Rail passengers endured delays of up to two hours today on busy routes linking London and Scotland.
The problems were caused by a broken-down train at Huntingdon which led to severe hold-ups on a number of services in eastern England.
Worst hit were customers with the First Capital Connect (FCC) train company who had to contend with long delays between London and Peterborough.
FCC services were unable to run between Peterborough and Huntingdon, while trains operated by the East Coast, First Hull Trains and Grand Central companies were also affected, with delays up to 60 minutes.
Further north, ScotRail services were hit by a signalling problem near Edinburgh Park. Buses had to replace trains between Bathgate and Edinburgh Park.
This week has brought travel misery to many commuters, with morning rush-hour delays proliferating.
There were also problems on the Tube this morning, with severe delays on the Bakerloo line following a fire alert at Regent's Park station.