Well, no, not in general.
But inflexible mobilisation tables certainly had a lot to do with the problem of not being able to stop events from cascading in the summer of 1914. The German Imperial General Staff, in particular, had whole sets of meticulously planned railway schedules to move troops to the front. When Wilhelm II - for all of his bravado and aggressive posturing in the past - tried to stop things at the 11th hour, he was essentially told it was impossible because the trains were already running.
Of course, it wasn't impossible. The staff officer in charge of troop transportation stated after the war that German mobilisation could've been slowed or even halted. But the German General Staff believed it was better to fight a war with Russia and France sooner rather than later. The reasoning behind it was the belief that the longer Germany waited, the more difficult it would be to win against France and a rapidly modernising Russia. Naturally, this mentality wasn't shared by everybody in Berlin (and certainly not Wilhelm II, who was definitely one befuddled, indecisive, and easily influenced monarch).