The new rail connection that opened yesterday also expands the catchment area of BER Airport.
The long distance train station Berlin Südkreuz can now be reached in 12 minutes, and Berlin Central Station can also be reached more quickly.

Here is a selection of cities with the total travel time to BER Airport:

Leipzig: 1 hour and 29 minutes, including one train change

Dresden: 1 hour and 31 minutes, direct (already existed)

Cottbus: 1 hour and 6 minutes, direct

Erfurt: 1 hour and 59 minutes, including one train change

Wolfsburg: 1 hour and 55 minutes, including one train change

Hanover: 2 hours and 7 minutes, including one train change

Braunschweig: 2 hours and 11 minutes, including one train change

Magdeburg: 2 hours and 1 minute, including one train change

Hamburg: 2 hours and 26 minutes, including one train change (from May, when the complete renovation of the line to Hamburg is finished)

Rostock (with cruise port): 2 hours and 29 minutes, direct

Chemnitz: 2 hours and 40 minutes, direct (already existed)

In about two years, Szczecin will also have a direct rail connection to the airport, with a journey time of approximately 1 hour and 50 minutes.

Here is the English press release from BER Airport on the improved rail connection:
https://corporate.berlin-airport.de/...ndung-ber.html

The English website of the German train company Deutsche Bahn, used to get the travel times:
https://int.bahn.de/en