Compound locomotive
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![Typical early de Glehn's locomotive (Baden IV e of 1894), with high-pressure cylinders placed behind a front bogie, and driving the second set of wheels.](/Images/godic/202502/15/Badische_IVe0820.png")
![Burrell road locomotive, showing high and low pressure cylinders.](/Images/godic/202502/15/Burrell_engine_Capper0820.jpg")
A compound locomotive is a steam locomotive which is powered by a compound engine, a type of steam engine where steam is expanded in two or more phases. Colloquially referred to as a compound engine, the locomotive is only one application of the compounding principle.