With questionable assumptions, I'm getting: (10% of 500'000 men) tonnes/day * 1 wagon/60 tonnes = 800+ wagons/day which sounds like a lot of (theoretically in

With questionable assumptions, I'm getting: (10% of 500'000 men) tonnes/day * 1 wagon/60 tonnes = 800+ wagons/day which sounds like a lot of (theoretically interruptible) traffic. Using the model of the US Civil War, which also had an environment where defence easily beat offence, the side that mustered the most industrial output won. That suggests the centre of mass of UA's fight to be less logistical and more political.