What you can claim after a delay or cancellation depends on a number of variants - train company, type of ticket and length of delay.
The Government today announced it is to cap the increases of regulated fares planned for January 2014.
Rail fares are going up in January but they have been capped and will increase by a maximum of 6.1%.
Delayed rail passengers should be compensated in cash rather than vouchers, watchdog group Passenger Focus said.
Chief executive of the group David Sidebottom said the main reason passengers contact them are over concerns to do with train delays, refund conditions and levels of compensation.
Mr Sidebottom said the group would like to see compensation regime improvements in new rail franchises being introduced over the next few months. Rail minister Stephen Hammond welcomed the findings of the report by the Office of Rail Regulation. He said:
"I am determined that passengers have the best possible experience on our railways so I welcome the ORR report.
"Our new franchising agreements are ensuring that more-generous compensation schemes are in place for passengers and it is essential they know how to claim. I will continue to push operators to do all they can to make sure passengers are fully aware of their rights."
A rail watchdog has described the regulators findings as "concerning" and said that more needs to be done to alert rail passengers to their refund and compensation rights for disrupted services.
– David Sidebottom, acting chief executive of rail traveller watchdog Passenger Focus
When trains are delayed or cancelled, it is important that passengers are made aware of their rights to a refund or compensation.
It is of concern that as many as 75% of rail passengers 'do not know very much' or 'nothing at all' about their rights.
This is a problem that needs addressing. The top issues raised by passengers contacting us regularly include train delays, refund conditions and levels of compensation.
More than three-quarters of train passengers are unaware of their compensation and refund rights when trains are delayed or cancelled, according to a report by rail regulators.
A survey and study groups revealed more than 75% of rail passengers "do not know very much" or "nothing at all" about what they are entitled to when services are disrupted.
The Office of Rail Regulation report also showed that 74% of the passengers questioned said that train companies do "not very much" or "nothing at all" to proactively provide information about compensation when there are delays.
French authorities said it had considered a railway track in the French Alps to be safe before two people died when a tourist train was derailed by a falling boulder.
Regional transport official Jean-Yves Petit said that even in winter "the track isn't unusually dangerous".
About 30 people were onboard the train, which was left dangling from a clifftop for hours after the incident.
A train travelling through the French Alps was left dangling for hours after being derailed by a fast-falling boulder.
Two people were killed and nine injured after the so-called Train of the Pines was hit by a boulder just outside the town of Annot.
The mayor of the town Jean Ballester said the rock fell with "an extraordinary force".
French authorities have confirmed that two people were killed and nine were injured after a giant rock derailed a train outside the town of Annot.
Around 30 people were on board the tourist train travelling in the French Alps.
Two rescue helicopters were dispatched to the area to help evacuate the stricken train.
Two people, including a Russian tourist, are reported dead after a train derailed in French Alps, 150 kilometers north of the coastal city of Nice.
Firefighters and medical staff had some difficulties reaching the remote snowy site.
Railways of Provence experts told a local newspaper Nice-Matin a rock falling on the tracks might have caused the accident.
Train companies should lower fares to help people affected by the floods, Transport Secretary Patrick McLoughlin has said.
"People's rail travel is getting affected. I want train companies to help them by reducing their fares," he said, Inspecting the devastating damage to rail tracks at Dawlish in Devon.
McLoughlin denied the Government had been slow to respond to the flooding but recognised that people "were angry", adding he was hopeful Network Rail would keep their promise of repairing the destruction at Dawlish, that has severely disrupted south-west England train services, in around six weeks.
A number of South West Trains services have been cancelled or delayed due to flooding and "electricity supply problems".
We are currently unable to run between Portsmouth and Fareham due to electrical supply problems.
Flooding in the #Fulwell area means that trains cannot run between Shepperton and Teddington until approximately 09:30