Steam Engine, Personal (3.5e Equipment)
From D&D Wiki
This object allows for the generation of steam power, it is used to power many steam generators. It has a hardness 10, hit points 10 and AC 10. Each generator has a specific attachment which is always compatible with this. A personal steam engine uses half your backpack slot, you may still have a small pack on your back. Each personal steam engine can only power a maximum of 2 generators at any one time.
List of steam generators:
Steam Pressure Generator
Cost 500gp; Weight 15lb.