It has cost £4.1m to mothball Waterloo Station's international platforms over the past three years, new figures show.
The Eurostar terminals at the south London station closed in 2007 as high-speed rail services to the continent moved to St Pancras.
It had been hoped they could be used by commuter services but this has not happened.
The Department for Transport said it was committed to using the platforms for domestic use.
The figures had been obtained by the Liberal Democrat group on the London Assembly via a freedom of information request.
They show only £60,000 has been raised by charging for filming and theatre productions.
'Waste of money'
Liberal Democrat London Assembly member Caroline Pidgeon said: "It's absolutely appalling that when commuters are suffering with over-crowded trains and over-crowded platforms, they look over and see £4m being spent leaving these platforms empty.
"Government ministers have got to stop this waste of public money."
BRB (Residuary) Ltd which is looking after the platforms is to be scrapped by the government.
BBC London's transport correspondent Tom Edwards said the responsibility might now fall to Network Rail.
Rail Minister Theresa Villiers said: "The government is committed to bringing the former international platforms at Waterloo into domestic use and therefore it is vital that the facility is kept safe, secure and serviceable.
"We expect to make an announcement on the future of Waterloo in due course."