Design
They were a further development of the S 2 and used the same boiler. The "S" stood for Schnellzuglokomotive, or express locomotive, of which the S 3 was a large and powerful type. Because larger turntables with a 16 metre diameter were then being built, the wheelbase could be longer, which gave it better riding qualities. The locomotive had one high-pressure and one low-pressure cylinder, coupled to four driving wheels in a 4-4-0 configuration.
They were the first class of locomotives to use superheating, a process in which the steam leaving the boiler is re-heated, resulting in better efficiency.
Read more about this topic: Prussian S 3
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