ScotRail and Network Rail have issued an apology to customers for disruption to services over the last year.
The open letter says sorry for poor services between Glasgow and Ayrshire, Renfrewshire and Inverclyde.
The letter was written by Steve Montgomery, ScotRail’s managing director, and David Simpson, Network Rail’s route managing director.
It says: "We are sorry that performance over the past 12 months was below the level you expect from us."
The pair said that the disruption had a number of causes including severe weather, vandalism and the impact of major engineering works in connection with the £170m improvements along the lines between Paisley and Glasgow.
They also state that the works by Network Rail are now complete but added: "We fully understand the inconvenience caused whilst the works took place and appreciate your patience during disruption."
In the letter they also insist: "Punctuality and reliability levels have now returned to target, but we remain committed to bringing about further improvement.
"Our priority has been to return our services back to the levels you deserve, and we have worked closely to achieve this, with much better performance in recent months."
They say a new fleet of modern, comfortable electric trains are now serving the Ayrshire, Inverclyde and Renfrewshire routes bringing real benefits for travellers.
The letter also states that Network Rail is investing in improvements to track and signal reliability, tackling vandalism and increasing the resilience to severe weather.
And it revealed new services will be introduced in the December 2012 timetable, with details to be announced in due course.
The letter ends: "Thank you for your patience. We are committed to giving more people than ever before the opportunity to travel by rail."
Bob Davidson, chief executive of Renfrewshire Chamber of Commerce, welcomed the apology.
He said: "We are pleased to hear that local rail disruptions have been formally recognised and that improvements are now complete.
"We hope this will now allow the businesses and people of Renfrewshire to once again travel around in a timely manner.”
Val Russell, chief executive of Ayrshire Chamber of Commerce and Industry, said: "Ayrshire's rail connections with Glasgow and the wider country are fundamental to our economic success and our ability to grow our indigenous businesses and to attract new investors to the area.
“The disruption to a number of services over the past year has been unfortunate but we recognise the investment and commitment being made by both ScotRail and Network Rail to deliver significant improvements to Ayrshire's rail services, most visibly through the introduction of modern, well equipped new trains."
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