The attack on the German transportation system, beginning in September 1944,was the single most important cause of Germany’s ultimate economic collapse. The effects of the bombing on the German rail and water transportation systems were almost exactly as envisioned in AWPD-1 and AWPD-42. Transportation targets received almost one-third of the total bombs dropped throughout the campaign from 1944-1945 with decisive results.
Bombing raids decimated rail yards, depots, bridges, and canals. After October 1944, it became impossible for the rail and waterway systems to meet transportation requirements. From December on, all sectors of the German economy were in rapid decline.
http://etd.lsu.edu/docs/available/et...ole_thesis.pdf
A study of the effectiveness of Allied bombing yields one consistent lesson. The attacks on almost any of the target priorities; cities, ball bearings, aircraft factories, oil production, could have brought about a rapid end to the war if the initial raids had been sustained.
Harris was right.