Prussian G 5.1
| Prussian G 5.1 DR series 54.0 PKP Ti1 |
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 Prussian G 5.1
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| Numbering: | DR 54 001-071 |
| Number: | 268 |
| Year of construction (s): | 1892-1902 |
| Retirement: | 1929 |
| Type : | 1'C n2 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 15,990 mm |
| Service mass: | 48.5 t |
| Friction mass: | 39.9 t |
| Wheel set mass : | 13.7 t |
| Top speed: | 65 km / h |
| Driving wheel diameter: | 1,350 mm |
| Impeller diameter front: | 1,000 mm |
| Number of cylinders: | 2 |
| Cylinder diameter: | 450/480 mm |
| Piston stroke: | 630 mm |
| Boiler overpressure: | 10/12 bar |
| Grate area: | 2.29 m² |
| Evaporation heating surface: | 137.00 m² |
| Tender: | pr 3 T 12 |
| Water supply: | 12.0 m³ |
The vehicles of type G 5.1 of the Prussian State Railways were the first freight locomotives of the type 1'C n2 in Europe. It was developed from the Prussian G 4 series. Between 1892 and 1902 a total of 268 examples of these vehicles were put into service in Prussia . The twin G 5.1 was designed to increase the speed of freight trains on main lines. In addition, stronger machines had become necessary for the increasing train loads. The locomotives, which were equipped with a compressed air brake , were also used in express freight trains and passenger transport due to their top speed of 65 km / h. The G 5.1 was equipped with an internal Allan control, the running axle was designed as an Adam axle.
In 1923, the Reichsbahn took over 169 G 5.1 as 54 001 - 168 and 54 182 in their re-designation plan for regional railway locomotives , in 1925 only 71 units were re-designated with the company numbers 54 001 - 54 071 . The locomotives were all retired by 1930.
The PKP had 28 machines under the series designation Ti1 in their portfolio. After the occupation of Poland in World War II , three G 5.1s were returned to the Reichsbahn as 54 601 - 603.
The vehicles were a Tender equipped to type pr 3 T 12th