Prussian G 7.3
| Prussian G 7.3 Mecklenburg G 7.3 DR class 56.0 / 2 PKP Tr1 |
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| Numbering: | DR 55 701, 56 001-005, 56 201-205 |
| Number: | 85 |
| Year of construction (s): | 1893/94 and 1917 |
| Retirement: | until 1945 |
| Type : | 1'D n2v |
| Genre : | G 45.17 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 16,318 mm / 17,352 mm |
| Service mass: | 56.2 t / 60.5 t |
| Friction mass: | 50.5 t / 52.5 t |
| Wheel set mass : | 12.63 t / 13.13 t |
| Top speed: | 45 km / h |
| Driving wheel diameter: | 1,250 mm |
| Impeller diameter front: | 1,000 mm |
| HD cylinder diameter: | 530 mm |
| LP cylinder diameter: | 750 mm |
| Piston stroke: | 630 mm |
| Boiler overpressure: | 12 bar / 14 bar |
| Grate area: | 2.31 m² |
| Evaporation heating surface: | 146.9 m² |
| Tender: | pr 3 T 12 / 16.5 |
| Water supply: | 12.0 m³ / 16.5 m³ |
| The second number refers to the delivery year 1917 | |
The steam locomotives of the Prussian class G 7.3 were the third of the G 7 series and were intended for the transport of heavy freight trains on steep inclines, on which the permissible axle load was not yet that high. This affected, for example, the Paderborn – Holzminden and Betzdorf – Siegen routes .
A larger boiler could be used due to the front barrel axis. Like the G 7.2, the G 7.3 was constructed in a composite design . A total of only 15 of these locomotives were built between 1893 and 1895, all by Hanomag , as the increase in the permissible axle loads meant that the cheaper G 7s without a front running axle could also travel on these routes. During the First World War , this type was remembered because it needed simple locomotives with a low axle load, and production started again. Another 70 units were built by Maffei, Krauss and the Esslingen machine factory. They differed from the old delivery series with, among other things, the higher boiler pressure of 14 bar and a feed water preheater. They were delivered directly to the Deutsche Heeresbahnen.
After the First World War , some locomotives had to be sold abroad. The PKP operated 23 machines under the series designation Tr1 .
The Friedrich-Franz-Bahn in Mecklenburg bought five G 7.3s through old trade and the Lübeck-Büchener Eisenbahn bought four. In 1925, the Deutsche Reichsbahn included eleven copies in its drawing plan for steam locomotives . The G 7.3 from Prussia got the road numbers 55 701 and 56 001–005 , the vehicles from Mecklenburg the road numbers 56 201–205 . After the nationalization of the Lübeck-Büchener Railway in 1938, two G 7.3s were added to the Reichsbahn's portfolio as 56 001 and 002. After 1945 they were no longer available.
The vehicles were Tender senders equipped pr 3 of the type T 12 (of construction 1893/94) or pr 3 T 16.5 (Year 1917).
