Aalen Ordnance Rebuild Shop (Source: Webmaster's collection) WWII-era M-426 tractors, delivered by rail to the Aalen shop for rebuild, are seen here being unloaded from flat cars on the factory's rail spur. Some of these tractors might very well be ones that pulled the semi-trailers that hauled large tonnages of critical supplies along the famous RED BALL EXPRESS line in France during the war.