Greater Anglia, in the east of England, was disrupted by a strike by train drivers.
The ASLEF union members are staging their second strike within two weeks. This latest 24-hour walkout is about a dispute over the pay.
Passengers were warned that they might have difficulty getting between stations in the area and London on Saturday.
Jonathan Denby, Greater Anglia's director of communications, said that a minimum service was available between Norwich and the capital.
There were only six trains running between London and Norwich, with the last train ending earlier than usual at 21:30 BST.
The company stated that Sunday services will begin earlier than usual because of the 24-hour strike. No regional or branch lines and no service will be available on Sunday.
"The impact of a train driver strike is always going to have quite severe consequences," stated Mr Denby.
"We apologise again. It is best to avoid traveling if possible and to search for other options.
"We are clearly looking to settle the dispute as soon possible,"
Nigel Gibson, ASLEF, stated that his members have not received a pay increase since April 2019.
He stated that "we believe that working people should be paid more to keep the cost of living up."
"Our members working for Greater Anglia are currently on between PS38,000 to PS52,000, despite what transport minister said in relation to average earnings of train drivers (he claims it is PS59,000.")
Gibson stated that he expects other unions will stage further strikes following the return of the ballot results next month.
Greater Anglia services link the counties of Essex, Hertfordshire and Suffolk to London.
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