"What happens when you weaponize all the horsepower of a full-size steam locomotive?" asks Professor T. Lemetry. "You get the Goliathon. One shot can level a building, down an airship, or turn a man inside out."
I bet it can take down Morlocks, too.
In any case, this is how the Nerf Vulcan should have been designed. Not out of cheap plastic, but awesome copper and brass.
The Goliathon features copper piping, brass decorative elements, and four gauges. There's also a metal valve wheel that gives it even more heft.
Sadly, it doesn't fire lasers, musket balls, or even Nerf balls.
It's only a prop, but would add to anyone's steampunk kit. As well as terrify anyone or anything that gets too close to your airship. Price tag: $350.