Xanxus is the misunderstood villain of arc 2. He has 2 guns that shoot big energy blasts. Train has one gun but it’s stronger than antimantium. Also he has the super rail gun which is bigger than Xanxus’s beams. They are both great at hand to hand combat. Train wins.

Update 8 7 2020 Train won’t be able to keep up with Xanxus speed. Xanxus wins.