▁of ▁Germany . ▁A ▁border ▁was ▁established ▁between ▁Bü chen ▁and ▁Schw an he ide , ▁separ ating ▁West ▁Germany ▁and ▁East ▁Germany , ▁as ▁well ▁as ▁between ▁Al bre cht sh of ▁and ▁Sp and au ▁West ▁separ ating ▁West ▁Berlin ▁and ▁East ▁Berlin . ▁In ▁East ▁Germany ▁the ▁second ▁track ▁was ▁dis m ant led ▁for ▁re par ations ▁to ▁the ▁Soviet ▁Union . ▁Despite ▁this , ▁the ▁line ▁continued ▁to ▁an ▁important ▁route ▁for ▁internal ▁East ▁German ▁trains ▁between ▁Berlin , ▁Sch wer in ▁and ▁W ism ar ▁and ▁inter zone ▁trains ▁( se aled ▁trains ▁that ▁ran ▁non - stop ▁between ▁West ▁Germany ▁and ▁West ▁Berlin ), ▁in ▁both ▁cases ▁for ▁passenger ▁and ▁fre ight ▁trains . ▁In ▁the ▁Deutsche ▁Bundes bahn ▁( G erman ▁Federal ▁Rail ways , ▁DB ) ▁network ▁in ▁West ▁Germany ▁the ▁line ▁between ▁Bü chen ▁and ▁Schwar zen bek ▁the ▁second ▁track ▁was ▁also ▁dis m ant led . ▁Deutsche ▁Reichs bahn ▁( E ast ▁German ▁rail ways , ▁DR ) ▁Class ▁ 0 3 ▁steam ▁locomot ives ▁ha u led ▁inter zone ▁services ▁to ▁Hamburg - Al ton a ▁in ▁the ▁ 1 9 5 0 s ▁and ▁ 1 9 6 0 s . ▁From ▁the ▁summer ▁tim et able ▁of ▁ 1 9 7 3 , ▁DB ▁and ▁DR ▁locomot ive ▁were ▁ex changed ▁in ▁Bü chen . ▁DR ▁operated ▁dies el ▁locomot ives ▁of ▁class ▁V ▁ 1 8 0 , ▁later ▁ 1 1 8 ▁and ▁ 1 3