I just got this question and I think it's good more people know about this option to get from Brussels to Maastricht for just about less than 10 euros. Well, I'm actually going to discuss the third cheapest way to get from Maastricht to Brussels. Of course the two cheapest ways are hitchhiking and walking (in this order, since you'll be very hungry when walking from Brussels to Maastricht). If you take the train in Belgium often enough this works.
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