A total of 881 complaints made about the rail service, which operates from cities including Glasgow, Inverness, Aberdeen and Edinburgh, since it was returned to public ownership in June 2023.
The figures obtained by the Scottish Tories through freedom of information requests revealed nearly a third of all complaints related to the upkeep and train conditions.
A breakdown of the figures showed that 519 complaints were made between June 25 2023 and March 31 2024, while a further 364 were made up to September 14 2024.
Of those, 286 related to upkeep and repair of the trains – 32.4%.
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Other complaints also included service reliability, the attitude of staff, comfort of seating and the complaints handling process.
However, Transport Scotland has said there has been a “significant downward trend” in complaints since the rail service was returned to public ownership.
Complaints have decreased by 39% when compared with the 12 months prior to nationalisation, according to the Office of Rail and Road (ORR) report.
But Sue Webber, transport spokeswoman for the Scottish Tories, warned ministers the nationalisation was “costly and unreliable” for commuters.
She said: “The SNP’s nationalisation of the Caledonian Sleeper is not going to plan.
“Just like SNP-run ScotRail, it looks like they have messed up the nationalisation of the Caledonian Sleeper as well.
“Passengers are receiving a sub-par service and as a result complaints have continued to pour in from them.
“Taxpayers have also had to foot the bill for nearly a million pounds in compensation payments, largely for delayed services.
“If the SNP wants to get people out of their cars and onto public transport, then they must change their current approach.
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“Common sense should tell them that passengers won’t put up with train services that continue to be costly and unreliable.”
It had previously been revealed that £965,672 had been paid out to Caledonian Sleeper passengers in compensation for delayed or cancelled services.
But Transport Scotland said that third party companies which can often be responsible for the delays in service, fund the compensation fee to the Caledonian Sleeper.
A spokesman for the Scottish Government said it was “clear public ownership is making a difference” to the Caledonian Sleeper.”
“While cancellations represented less than 3% of all services (September 2023 to September 2024), it is only right that passengers are compensated when disruption does occur,” the spokesman said.
“Right time Caledonian Sleeper arrivals have also improved to over 88%, from 81%, well above the GB average.
“The latest ORR passenger satisfaction results show that almost 90% of Caledonian Sleeper guests were satisfied with their overall experience, with complaints representing just 0.2% of the almost 400,000 journeys made since the Caledonian Sleeper came into public sector control.
“Indeed, the latest ORR figures also show that complaints were down by 39% in the 12-month reporting period (April 2023 to March 2024) in comparison to the 12 months prior – demonstrating a significant downward trend during public sector ownership.
“These often-repeated references to already well-recorded past disruption once again fail to acknowledge not only these improvements, but also that many cancellations are not within Caledonian Sleeper’s control.
“It is clear that public ownership is making a difference to Caledonian Sleeper, it’s passengers, and its staff – anyone with a genuine interest in its services would acknowledge this.”