Light railways carried supplies forward and casualties back

The WDLR companion volume expands the earlier railway map into equipment and operating practice. It shows petrol-electric Simplex tractors, protected wagons, repair facilities, and engine sheds that became valuable artillery and air targets. The railways supplied troops moving through a planned cycle between the front line and reserve positions despite mud and inadequate roads. Trains that carried ammunition and food forward could return with wounded personnel, often reaching casualty-clearing stations more reliably than ambulances on damaged roads. The network worked in both directions, sustaining combat power on the way in and medical evacuation on the way out.