The most serious nationwide strike to hit France in years caused new misery for weekend travellers on Saturday, with unions dismissing proposals by the government and warning walkouts would last well into next week.

The challenge thrown down to President Emmanuel Macron over his plans for radical pension reform has prompted hundreds of thousands to take to the streets and brought key transport services to a standstill.

The strikes, which began on Thursday over the plans for a single points-based pension scheme, recall the winter of 1995, when three weeks of huge stoppages forced a social policy U-turn by the then-government.

Unions have vowed a second series of mass demonstrations nationwide on Tuesday after Thursday's big rallies and there is expected to be little easing of the transport freeze over the coming days.

The strikes could prove to be the biggest domestic challenge yet for Macron, who came to power in 2017 on the back of promises to radically reform France and has sought a prominent place on the international stage as Europe's number one statesman.

Macron was widely believed to have ridden out the challenge posed by the "yellow vests" whose weekly Saturday protests against inequality in France had shaken the government over the last year.

But the yellow vests have also sought to use the momentum of the strike movement and held a fresh protest in Paris on Saturday and others in several cities across France.

"When we see the extent to which Macron is carrying this unfair pension reform through right to the end... we think we must not let up," warned Sophie Tissier, co-organiser of the protest.

'Intensify the movement'

Prime Minister Edouard Philippe insisted on Friday that the government would not abandon the plan, though he added it was prepared to bring it in gradually.

But while he said he did not want "confrontation", the unions are determined to keep the current pensions system of special regimes for public sector workers.

In a joint statement, the three main rail unions called for the strike to be stepped up on Monday.

To the question of how long the action would last, Laurent Brun, head of the CGT's railworkers branch, said: "The railworkers are not fixing any limits."

The SNCF rail operator has warned that disruption at the weekend will be at the same level as the last two days, with just 10-15 percent of high-speed and regional trains running.

The Paris metro will remain severely disrupted with nine lines entirely shut, five only partially running and just the driverless 1 and 14 lines working normally.

There were also many cancellations on the international Eurostar and Thalys services.

Air travel was less hit by the strikes and was returning closer to normal Saturday, as the civil aviation authorities dropped air traffic restrictions.

Unions say Macron's proposal for a single-pension system would force millions of people in both the public and private sectors to work well beyond the official retirement age of 62.

At least 800,000 took part in rallies around the country on Thursday, according to the interior ministry -- one of the biggest demonstrations of union strength in nearly a decade.

A crucial week now lies ahead: commuters will struggle to get to work on Monday and more giant nationwide protests are planned for Tuesday.

Then on Wednesday, Philippe is due to unveil full details of the reform which could spark more union anger.

Museums, opera closed

Tourists in Paris also faced some disappointments: the world-famous Louvre Museum said some rooms would be closed due to the strikes, while the landmark exhibition of painter El Greco at the Grand Palais was closed.

The Paris Opera and several theatres in the capital have cancelled performances over the last few days due to the strike.

And businesses feared that the lack of transport would hit shopping on a key weekend in the run-up to Christmas.

In the southeastern city of Lyon, where hotels are usually full to bursting at this time of year for a light festival, hoteliers complained of a lack of custom as travellers put off stays.

"We are down 10 or 20 percent in reservations but for some hotels it is 30 percent," said Lyon hotelier Laurent Duc, head of a national hotel union.

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