A train company that has come under fire since it introduced a new timetable says it is ‘confident’ its service will “revert to previous standards” next week when more changes are made.

Commuters have criticised Chiltern Railways for delayed and overcrowded trains since the autumn timetable was introduced on October 25 to coincide with the opening of a new line between Oxford Parkway and London Marylebone on October 26.

The company apologised for ‘falling short’ of their usual standards a week before announcing changes to the timetable, which includes extra capacity on rush hour services.

However, some commuters think the changes will not make a difference to overcrowding on rush hour services.

Jane Appleton, who travels into London from Haddenham, said the company’s “previously excellent” service has become a ‘shambles’ since changes were made to the timetable and has started a Twitter page called ‘Chiltern Failways’ to gather opinions.

She said: “The new timetable took services away from busy commuter services such as Gerrards Cross and Beaconsfield and caused complete meltdown at rush hour. Service staff now say the issues are unlikely to be fixed until May 2016.

“I pay almost £5,000 a year to travel from Haddenham and Thame Parkway into London. I pay another £1200 to park. In November, I travelled on 22 days - and on 19 days I was delayed. So far in December I have travelled on four days - every single journey was delayed.”

The fed-up commuter also raised concerns over passenger safety because of overcrowded trains.

She said: “Trains are now so overcrowded they are unsafe. I have heard of two incidents in the last weeks of passengers collapsing and ambulances being called.

“The most recent of these was in West Ruislip [on Tuesday] night. Passengers were then held another 20 minutes after the ambulance had left with passenger on board.

“When passenger safety is an issue something needs to be done before someone is seriously hurt.

“It feels slightly ridiculous to complain about constant delays, but this affects my ability to get to work which could ultimately affect my ability to keep my job and my income.”

Jennifer Payne, customer services director at Chiltern Railways has attempted to reassure passengers that they are taking their feedback into account.

She said: “We are aware that some of our customers are having a less than positive experience at the moment. I would like to assure passengers that we are listening.

“Following the opening of Oxford Parkway station, we made late changes to the timetable to accommodate some of the feedback we were getting. Admittedly we’ve had a run of issues recently that have exacerbated the bedding-in of the new timetable, including leaf-fall, and rolling stock incidents.

“We appreciate that passengers have been patient and we would like to assure everyone who uses our service that we are examining all of the issues.

“Overall we are confident that when the December timetable starts on December 13, our performance will start to revert to previous standards.”

Commuters can ‘Meet the Manager’ at London Marylebone this evening until 6pm.

The new managing director, customer services director and a representative from Network Rail will be at Gerrards Cross tomorrow, Thursday, December 10 between 7am and 8.30am.