There are 2 train companies operating 2 routes - ICE 79, RE1. The cheapest train costs $45 and is 3h 13min.
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There are 4 ways to travel from BRU to DUS. 2 flights, 1 train, 4 buses and 1 by car are possible between the two areas. The by car from BRU to DUS is the cheapest and fastest. The train operated by running from Zaventem to Angermund is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!