Answer:
Step-by-step explanation:
Remark
Superiority in mobility is always advantageous in war. You are able to move men, their equipment, and what they need to keep them alive even when not in battle around much better than your enemy could do if you have mobility. The North had that advantage in her rail system, and her ability to produce more rails if the ones she had were destroyed.
While the South moved around mostly on horses (very effectively), the rail system moved more people around and quicker with the use of the railway.