Quickest 2h 44min
There are 4 buses1 train company operating 6 routes - IC77, ICE10, ICE12, CNL 1258, ICE11, RE3 from Berlin to Braunschweig. The cheapest train costs $34 and is 3h 15min.
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There are 3 ways to travel from Berlin to Braunschweig. 4 buses, 3 trains and 1 by car are possible between the two areas. The by car from Berlin to Braunschweig is the cheapest. The train operated by DB running from Albrechtshof to Braunschweig is the fastest. The train operated by DB running from Berlin Ostbahnhof to Braunschweig-Gliesmarode 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!