After several expansion stages , a continuous railway connexion was finally established in 1928 , i.e. 60 years after the start of construction .
Only when the respective national railways were under the sovereignty of the German Reich .
After several expansion stages , a continuous railway connexion was finally established in 1928 , i.e. 60 years after the start of construction , and only when the respective national railways were under the sovereignty of the German Reich .