The biggest rail workers' union has hit back at claims that widespread cancellations of trains on Northern Rail on Sunday was caused by some staff making themselves "unavailable" for work.
The company cancelled around 80 services across its network, mainly affecting Liverpool, Lancashire and Greater Manchester.
Northern apologised to passengers affected by the disruption, saying in a statement:
Mick Cash, general secretary of the Rail, Maritime and Transport union, said:
Rail replacement buses were used, and an amended timetable for trains was put in place.
Mick Whelan, general secretary of the train drivers' union Aslef, said: