The Personal Steam Engine is a cosmetic item only obtainable through the Accessory Vendor in Freeport for either 15 Loyalty Tokens or 50 Premium Tokens. Even though it says that this is cosmetic, this does boost your stamina regeneration a bit. Though not enough to be that useful.
Trivia[]
While the Personal Steam Engine is equipped, steam particles can be seen fuming from the rear, cylindrical exhaust. You don't need coal to activate the engine.
A common myth about this item is that it increases speed, however this is a myth only.