Up to 100,000 rail workers in South Korea struck for three weeks last month against government plans for running a new bullet train service.
Unions say the plans amount to privatisation.
Tens of thousands of workers joined a mass demonstration in Seoul in solidarity with the strikers.
But although the government agreed to set up a committee to look into the running of the railways, it is going to push ahead with the plans.
Unions have said they will consider further action.