The German General Staff had detailed train tables for an Eastern deployment that were updated on a yearly basis. The General that commanded the Military Transportation Section, Staab I think was his name, wrote an entire book after the war to refute the comment that General Molke made to the Kaiser when he suggested that changing the Front was impossible. According to General Staab, if he had been given the order to concentrate to the east by August 1st, it could have been done. I think Molke's mind was more inflexible than the Train Schedules that the General Staff had created. He was just afraid of causing confusion by making a last minute change to a plan that Schlieffen and Molke, as his underling, had been anticipating for several years. We will never know of course, but it is interesting to contemplate the possible outcome of such a change.
"The fruit of too much liberty is slavery", Cicero