When you fight the Train, you will have to destroy all the carts in five minutes. To destroy a cart, target its weapons and use homing missiles to destroy them. Once all of a cart's weapons are destroyed, it will explode and a fleet of enemies will attack. Use Gauntlet to knock enemies into the walls and out of range. The first and fourth cart have machine guns, the second has laser beams, and the third has machine guns and a massive laser cannon that is easy to avoid. The fifth cart is defenseless.