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By October 1944, maintaining a state of interdiction on the all-important Innsbruck-Verona Brenner Pass rail route had proved to be a difficult, nearly impossible, task. The absence of any great number of points vulnerable to air attack made it possible for German engineers to concentrate bridging materials near all target sites, and to repair even extensive damage in a very short time. In addition, rail diversions had been constructed, or were under construction, around most of the vulnerable points. Weather was on the side of the enemy, for during the fall and winter months there were few days when this area was not cloud obscured. It was anticipated that weeks would pass before attacks could be repeated, weeks during which the Germans would have ample time to effect complete repairs on the line, and to move great quantities of war materials south to replenish the stores of the Armies fighting south of the PO. Thus the effects of temporary interdiction would be nullified. It was believed that if a bombing program could be carried out that would permanently reduce the capacity of the Brenner line in conjunction with the program of establishing blocks, it would cause depletion of stock in dumps south of the Alps and greatly augment the administrative problems besetting the enemy. With this in view, a careful study of power stations on the Innsbruck-Verona line was made.