The Saxon I F (one F) was a class of one 0-4-0 fireless steam locomotive built for the Royal Saxon State Railways.
The locomotive was manufactured in 1917 by the Sächsischen Maschinenfabrik in Chemnitz with the serial number 3981 for the Wülknitz Sleeper Works (Schwellentränkwerk Wülknitz; now the Oberbauwerk Wülknitz) as a shunting locomotive.
About 1970, the locomotive was withdrawn by Oberbauwerk Wülknitz, and was subsequently scrapped.
The locomotives differed both in the dimensions of the steam engine and in the permitted operating pressure of the steam accumulator .
The Sächsische Maschinenfabrik built another locomotive in 1922 with the serial number 4536 for their own use.