How did differences in railroad track gauge create supply problems for Germany?

During the invasion of the Soviet Union in 1941, the difference in railroad track gauge created significant logistical hurdles for the German military. The Soviet rail system utilized a wider gauge than the standard gauge used by Germany, rendering German rolling stock incompatible with Soviet tracks.12

This incompatibility forced the Germans to undertake the time-consuming and labor-intensive process of converting captured Soviet rail lines to a narrower gauge to accommodate their own trains. Furthermore, the Soviet Union’s scorched-earth policy exacerbated these supply problems; as Soviet forces retreated, they systematically destroyed or evacuated their own rolling stock, effectively denying the Germans the ability to utilize the existing rail infrastructure to support their rapid advance. These rail limitations, combined with a severe shortage of motor transport, severely hampered the Wehrmacht's ability to maintain the momentum of their offensive as they pushed deeper into Soviet territory.12