No, not by being driven by the engine. Here, the title refers to how they manage to stay on the tracks. The answer will probably surprise you. (I studied physics for several years and it did me!)
The problem is that we are just shaving Leviathan when we need to start draining its lifeblood until it's too anemic to do much harm. Right now, it's the one holding the straight razor and slashing throats right and left.