FS Class 690 II
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The Ferrovie dello Stato Italiane Class 690 was a 4-6-2 'Pacific' steam locomotive for express trains.
FS locomotive 69001 (later 690.001)
Compound locomotive
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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 stages. The locomotive was only one application of comp
FS Class 690 II
…as the superheater technology was becoming available, allowing the FS to discard what had been a widespread feature on many Italian locomotives, the compound engine, deeming the advantages of the simpler single-expansion engine coupled with superheated steam to be superior. The English author Peter Michael…
Vauclain four-cylinder compound locomotive Milwaukee Road class A2 No. 919.
Cutaway view of the cylinders (low-pressure on left, high-pressure on right) and valves (above) on a tandem compound engine
Nord 701, now a 4-2-2-0
Burrell road locomotive, showing high- and low-pressure cylinders.