what do these letters mean when buy train tickets

(GB) = Great Britain
(NL) = Netherlands, I am guessing that (Nl) is just NL with a small L for the second letter,

What site are you looking at?

A number of major cities in Europe ( and some small ones as well ) have multiple train stations , Paris and London have roughly a half dozen each . When booking a train , there is usually a choice that indicates " All Stations " . By choosing that , the computer will select the correct one . For instance , if you are in Paris and wish to travel to Chartres , the train leaves from Gare ( rail station ) Montparnasse . If you are unaware of this , enter Paris -toutes gares intramuros ( if you are on the French site , the English version is self explanatory ) and then proceed

For most major cities in Europe they do not have a main or central train station. And, of course, all trains do not go to all stations. Often times you can goggle the city and the wiki reference will list the train stations in that city. So, where are you trying to go? Maybe that would be more useful.

Hello Sam and Steven ,
The website I looked is b-Europe.com. I booked from London to Amsterdam from London St Pancras, then I need to book from Amsterdam to Bruges, there are Amsterdam (NL), and Amsterdam (NI) Rai expo to choose from. I don't know which one I should choose.
Thank you so kindly
Alley

Hi Frank,

I have to been fine tuning my first solo Europe trip. The following is my itinerary, with a lot of help from people reading my previous post. It has been amazing experience.
Thank you all for your kindly suggestions and advice. I learned a lot from reading everyone's reply. I have booked an Eurostar ticket from London to Amsterdam with one stop for 59 euro, plus an insurance for cancellation. Next decision will be next leg in the trip: Amsterdam - Brussels or Bruges; and then Brussels or Bruges -Paris. I don't know which one better as far as more convenient from which town to Paris. Can I stay in Bruges for two nights which take a day trip in Brussels? or do I need to spend one night in each city?

You want Amsterdam ( NL )

Yes, Amsterdam (NL) will put you in Amsterdam Centraal, The other one is a convention/trade fair outside of the city center. Of course, you can get from Rai Expo to Centraal on the Metro if you got it wrong.

Then Bruges has two destination as well, Bruges (Be), and Bruges-St.-Pierters (Be), I guess I should book to Bruges (Be)? Thank you thank you

Yes, Bruges (BE) is the main station, Bruges Sint-Pieters is the next station (going toward the coast) and a little further away from the historic district.

This is effectively a duplicate question. I answered on the other copy.