The first variant, called the T 1, emerged from a joint project with the firm of Krauss in their railway company's own workshop. The 12 locomotives built between 1871 and 1873 belonged to the few engines that were developed specifically for the Oldenburg railways. They had a boiler pressure of 98.1 kN and maximum permitted speed of 40 km/h.
These engines had already been retired on the formation of the Deutsche Reichsbahn.
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