The Kaiserliche Generaldirektion der Eisenbahnen in Elsaß-Lothringen or EL (English: General Directorate of the Imperial Railways in Alsace-Lorraine) were the first railways owned by the German Empire. In the early days, railway vehicles were almost exclusively and forcibly taken from the German railways, because French troops had taken with them almost all rolling stock in the region during the retreat. The French side later built copies of German railway stock, mainly based on Prussian prototypes.