An improvement of the successful pre-war PKP class Pt31 class, the main difference is the addition of circular tubes in the fire chamber, thereby significantly increased boiler performance.

This class also featured a superheater and many have mechanical stokers to feed coal into the firebox.

[1] The Pt47 easily reached speeds of 100 km/h (62 mph), with a heavy train, although is not as refined as the PKP class Pm36 - especially on routes with a lower quality track.

[1] From 1949, Polish tenders 33D48 were manufactured in Pafawag, next rebuilt to 27D48, when fitted with a mechanical stoker (water capacity 33 m3, then 27 m3).

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