There are 2 train companies operating 5 routes - IC/EC 27, CNL 451, ICE50, ICE12, RE3. The cheapest train costs $43 and is 2h 41min.
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There are 4 ways to travel from DRS to TXL. 2 flights, 3 trains, 4 buses and 1 by car are possible between the two areas. The by car from DRS to TXL is the cheapest and fastest. The train operated by running from Radebeul to Berlin 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!