The fault affected First Capital Connect and East Coast services through Cambridgeshire and Hertfordshire.
But on First Capital Connect for example you can get 10 tickets for the price of nine.
There are delays of 30 minutes on First capital Connect and of 15 minutes on Southeastern trains.
Many rail operators are running reduced services, including Southeastern, South West Trains, Southern Railway and First Capital Connect.
The problems at Radlett on Wednesday led to changes to First Capital Connect, East Midlands Trains and Southeastern services.
First Capital Connect said passengers could experience delays until 06:00 GMT on Friday.
Rail services on the busy First Capital Connect route were suspended for about three days as repairs were carried out.
Paul Oxley, of First Capital Connect, said the damage was "quite extensive" and delays were expected run into Friday morning.
First Capital Connect and National Express East Anglia also scored poorly - with respective satisfaction figures of 76% and 77%.
First Capital Connect are running the 50% longer trains on six services a day from Bedford, creating almost 1, 500 extra seats.
BBC: Longer trains set to ease congestion on Thameslink line
First Capital Connect operating trains between London and Norfolk through Hertfordshire said severe weather combined with engineering works brought changes to services.
First Capital Connect, Southern, South West Trains, Gatwick Express, Southeastern and Greater Anglia have cancellations and delays.
First Capital Connect said replacement buses were running between Peterborough and Biggleswade but warned that journey times could be extended by an hour.
BBC: Major delays on London and Peterborough East Coast line
First Capital Connect operating trains between London, Hertfordshire and Norfolk through Cambridge said severe weather combined with engineering works brought changes to services.
First Capital Connect said on Friday afternoon that its services were starting to return to normal, but that there would be "residual delays and alterations".
First Capital Connect says it hopes to run a normal service.
First Capital Connect, who run trains between London and Norfolk through Hertfordshire and Cambridgeshire, said snow and icy weather across its network was still disrupting services.
BBC: Cambridgeshire Police warn of ice patches on some roads
The problems at Radlett in Hertfordshire led to major changes to services run by three train companies - Southeastern, East Midlands Trains and First Capital Connect (FCC).
Train company First Capital Connect said it was running a normal timetable but spokesman Roger Perkins predicted delays on Thameslink through Bedford and the Great Northern route to King's Lynn in Norfolk.
The lowest ratings for overall satisfaction were given to Northern Rail (80%), First Capital Connect (81%) and Southern (82%) while Greater Anglia, First Great Western and London Midland all had 83% of passengers satisfied.
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