There are no plans to end the ban on passengers drinking alcohol on trains, ScotRail has said.
The franchise holder, brought back under public ownership in April, said there was "no timeframe to change the policy" despite it originally being described as a covid safety measure.
Opposition parties have called on ScotRail "to be straight with people" over the reasons for continuing the ban.
Passengers on ScotRail services were previously able to consume alcohol before 9pm as well as being able to purchase drinks on certain mainline trains.
But on-board hospitality was scrapped in November 2020 and booze banned as part of the rail network's response to the coronavirus pandemic.
The rail operator claimed the measures would help ensure physical distancing rules were maintained.
Despite covid restrictions being scrapped ScotRail said the ban was still being reviewed.
Stephen Elliot, ScotRail security manager, said: "The alcohol restrictions on ScotRail services were introduced during the pandemic to help support Covid-19 precautions and mitigations, and help us deliver a safe environment for people to travel by train.
"There is no timeframe to change the policy, but we will keep it under review."
Alcohol can still be bought and consumed on cross-border trains operated by franchises other than ScotRail.
Neil Bibby, Scottish Labour transport spokesman, said: "ScotRail are playing fast and loose with the word temporary now.
"Passengers have already put up with cuts to services and rip-off fares, and now they can't even get a coffee on the way.
"Public ownership was supposed to be a chance to put passengers first, but instead they are being treated as an afterthought.
"ScotRail need to start being honest with the public about these restrictions instead of hiding behind so-called temporary measures.
"It is important to acknowledge that there are real concerns, on the part of staff and fellow passengers, about a small anti-social minority.
"That anti-social behaviour needs to be tackled, however, it should not be allowed to completely prevent the vast majority of responsible passengers having a drink on the train if they wish to do so.
"This ban risks being a sledgehammer to crack a nut.
"Scotrail should be straight with people about their plans and carry out a full consultation with passengers and staff on this policy."
Graham Simpson, transport spokesman for the Scottish Conservatives, said: "Given the chaotic start passengers have endured so far under 'Natrail', then this review must take their opinions fully into account.
"Those who have to deal with anti-social behaviour on our trains such as staff and police must also be fully engaged in the process.
"However, this was supposed to be a temporary pandemic measure and this review seems to have been kicked into the long grass.
"This review must report back as soon as possible whatever its outcome and ensure passengers are firmly put first given the shambolic service they’ve experienced in recent weeks."
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