Seven trains that the PCs might one day need to travel openly on, sneak onto, wreck or rob,
There are a myriad of trains that run on the ley lines all through Vallermoore, delivering passengers and goods to their destinations, but they all have to give way by Law when the Royal War Train comes through.
From an episode of Justice League Unlimited:
The God of War creates a giant, unstoppable robot (golem, animated armor, etc.) as a weapon for one side in a civil war; his purpose is to prolong the war and create suffering and war among humanity.
Quote from Ares in that episode, which would go well with this idea: "That's all you mortals are good for! To fight and fight and fight until there is nothing left but charred land and blood and bones, and to end it all and then start again with the next generation!"