The engine in this rig is 4x Bronze Steam Turbines with Invar blades. Each is fed by 2x Bronze Boilers with joined outputs, heated by Bronze Gas Burning Boxes.
The turbines are joined using Bronze Gear Boxes merged in the middle with gears. The joined axle carries away 128 RU/t (32 * 4).
Removing the axle, the gearing can be seen.
