Belgium
Leave Brussels fast, and ride on red velvet seats to Cologne.
Return tickets are only £20 on the Belgian Railways Website (SNCB). Cologne is a great city: cheap, at £20 pp/pn in a 3-star hotel; excellent art galleries; and good beer.
The train for Bruges splits in two - make sure you are in the correct half.
Go to Brussels for good hotels and, if you are a pensioner, use it as a base to travel around Belgium for next to nothing by train.
Use the Eurostar deal with Belgian Railways to travel on from Brussels at no extra cost.
Take the Luxembourg bound train to Libramont and then the bus number 8 to Bouillon on the River Semois. Stay at the Hotel Panorama overlooking river, town, castle and hills.
Listen to the town carillon play the Ode to Joy. The walking in the river valley and on wooded hills is wonderful and the food in the town is excellent. Return, if you can, on bus 45 to Bertrix for spectacular views of the Semois, tiny villages and the hills. Take the train from Bertrix to Libramont and then back to Brussels.
Taking the Eurostar to Brussels entitles you to a free onward trip to anywhere in Belgium.
A Eurostar ticket entitles you to free ongoing travel by rail to anywhere in Belgium.
I have been on many Eurostar breaks and have only just realised you can use your Eurostar tickets to Brussels on trains anywhere in Belgium for 24 hours either side of your departure time.
If you have to change to a train for onward travel to elsewhere in Europe and you have any choice as to where to make the change, do NOT choose Brussels. It is an extraordinarily unpleasant station - dark, dreary, and poorly serviced - in which to hang around for a few hours.
Over 65s can travel on Belgian trains to anywhere else in Belgium for only 6 Euros!
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