By Train
Trains from Roosendaal/Belgium connect at Schiphol with trains going to the Amsterdam RAI station. At Schiphol you can change trains on the same platform. The fastest way to reach the RAI if you are coming from Germany , is to take the train to Amsterdam Duivendrecht station. Here you can change trains for the Amsterdam RAI station. There is also direct train connection with the Amsterdam RAI station from Rotterdam , the Hague , Leiden , Weesp, het Gooi and the Flevo polders. www.ns.nl 

By Tram & Bus
If you arrive at Amsterdam Central Station (CS), you can take the Amstelveen express tram 51 (travelling time: 12 minutes, exit at the Amsterdam RAI station) or tram 4 (travelling time: 30 minutes, exit at the RAI Europaplein). It is then a 5 mintute walk ahead towards the RAI.