There are 1 train company operating 4 routes - RE5, IC26, ICE28, ICE11. The cheapest train costs $37 and is 2h 42min.
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There are 4 ways to travel from RLG to TXL. 2 flights, 5 trains, 4 buses and 1 by car are possible between the two areas. The by car from RLG to TXL is the cheapest. The by car from RLG to TXL is the fastest. The train operated by DB running from Schwaan to Berlin Hbf 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!