France
If you're taking the TGV from Geneva in Switzerland make sure you have kept some euros as, amazingly, they don't take Swiss Francs.
When travelling with small children you are entitled to a free porter service at both eurostar stations.
Just ask. This service normally costs £10. I didn't know until someone pointed it out to me as I had so much luggage I had to ask for help.
Don't rush off from the marvellous Gare Du Nord railway station - take half an hour or so to have a good look around this amazing terminus.
Over a hundred years old, the fantastic Gothic canopy is held up by huge cast iron pillars (made in Scotland actually, where the only foundry large enough to make them was located!).
The whole structure reminds one of a vast cathedral. Outside too is most impressive, with outstanding stone carvings and a most impressive facade.
Although constantly noisy and busy, the station is world class and should be savoured, not swallowed and forgotten! Enjoy.
The Brasserie du Gard Du Nord is the best place to prepare for a Sunday afternon journey back from Paris.
All the classics, fantastic surroundings, plate of oysters and a chilled bottle of something lets you drowse contentedly all the way back to Londres!
On your next metro journey take a detour to Line 14 for a space-age theme park ride.
The high-speed "Meteor" line is driverless so you can sit at the front and enjoy an exhilerating driver's eye view along the eerie twisting tunnels.
It is much faster and better than London's Docklands Light Railway. Get off at Bercy Station to admire the platform's lush underground jungle.
The Métro can be expensive. Tickets can be purchased individually for €1.30, but a carnet (book of 10) is only €10 - split one with your friends.
Use Paris as the start of your Europe-by-rail trip - it's the perfect two day stop off before catching the overnight train to Rome or Barcelona.
Book a first class ticket and certain cities have VIP longes at the stations with free food and drink - a real bonus if you have time to kill before your train.
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