Why did the Germans use 3 railway gauges in the Channel Islands during World War 2 60 90 and 100cm?

During World War II, the Germans used three different railway gauges in the Channel Islands—60 cm, 90 cm, and 100 cm—primarily for logistical and strategic purposes. The varying gauges allowed for flexibility in transporting troops, supplies, and equipment across the islands, accommodating existing infrastructure and optimizing military operations. Additionally, the smaller gauges facilitated the movement of materials in more confined areas, while the larger gauge supported heavier loads, reflecting the diverse needs of the occupation forces. This approach also enabled the Germans to utilize existing railway tracks and adapt to the islands' terrain.