Rail bosses have pulled a billboard ad campaign from their stations - including London Victoria - because it is too political.
The National Union of Students posters, which accuse certain Liberal Democrats MPs of being liars for reneging on their tuition fees pledge, were torn down by Network Rail after initially being approved.
Emblazoned with the phrase "Broken promises leave a permanent mark", the billboards featured two clenched fists tattooed with the word "Liar".
The Liberal Democrat logo also appears inked on one of the hands.
NUS President Toni Pearce said: "[Their removal] doesn’t stop our campaign.
"You can delete a billboard image but you can’t erase betrayal.
"There are a fleet of vans travelling the country right now targeting pledge breaker seats across the country, and will do until May 8.
“Lies were told. Seats were secured because of them, and we just won’t tolerate it.”
The Lib Dems have frequently addressed the issue of their U-turn on fees, with leader Nick Clegg three years ago making a direct apology to voters for making a promise his party was "not absolutely sure we could deliver".
Some 28 of the party's 57 MPs, including Nick Clegg and Vince Cable, voted in favour of a policy that saw the annual price of higher education rise from about £3,000 to £9,000.
Another 21 voted against.
A spokesman told the Guardian there had been no party request for the billboards' removal.
“We did not win the election so we could not deliver every policy that we wanted to, especially as we went into government with a party that was determined to raise fees at a time when there was no money," he added.
"Instead we tried to get the fairest deal we could.”
A Network Rail spokeswoman said: "As a politically neutral organisation, we do not allow political activity on our stations and this applies to any forms of advertising or campaigning.
"In this instance it's clear that an error has been made, as the poster should not have been approved for use in our stations.
"We will be apologising to the NUS for the misunderstanding and will ensure that they do not have to pay for the display."
The posters, at stations in Manchester and Sheffield as well as London, were set to remain in place until after the general election on May 7.
