TRAVEL CHEAPER BY TRAIN INSIDE BELGIUM 
            
  People who are coming to train should  consider doing the following in order
  to get a cheaper train ticket. In Belgium we have a thing we call a GO PASS,
  it cost  1390 Bfr and  you can make  10 train trips  with it. The  system is
  easy, you buy one GO PASS and each  time you want to take the train you fill
  in the  pass , you have  to write down  the station where you  departure and
  your final destination and the date. So if you are with 2 people you fill in
  2 lines. That means that you can get 10 train trips for 139 Bfr each. If you
  are travelling in a group with more than 3 people whom are not older than 26
  it might be interresting to use one. I checked the 'Aridisk' and it seems to
  cost 490  Bfr for a normal  trip from the border  to Mons but by  using a GO
  PASS it is a lot cheaper. 

  What you should  do is the following  : You travel from your  country to the
  first station in Belgium,  there you buy a GO PASS you fill  in the pass and
  go to Mons, when you go back home you  just fill in the pass for the trip to
  the border and then  you use the ticket you bought from  the last station in
  Belgium till home. This way it will  cost you 1390 Bfr divided the number of
  people you  are to go from  the border to Mons  and back. If you  are with 5
  people it  will cost  you 279  Bfr in  stead of  490 Bfr.  So it  only get's
  cheaper when  you are more than  3 people, or if  you plan on using  it some
  other time again (a GO PASS is  valid for approx 3-6 months) This methode is
  usefull if  a ticked  from your  place till  Mons is  more expensive  than a
  ticket from your place  to the border + 279 Bfr. For  e.g. students from the
  Netherlands  that  come  on  Friday  and can  travel  for  free  inside  the
  Netherlands it will be cheaper.

  -Sleeping Dog / The Natives
  ÿ