Prussian T 11
| Prussian T 11 DR series 74 0-3 PKP OKi 1 |
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 Prussian T 11 "7512 Hannover" of the Minden Museum Railway
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| Numbering: | DR 74 001-358 |
| Number: | 470 |
| Manufacturer: | Union , Borsig |
| Year of construction (s): | 1903-1910 |
| Retirement: | 1974 |
| Type : | 1'C n2t |
| Genre : | Pt 34.16 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 11,190 mm |
| Height: | 4,200 mm |
| Fixed wheelbase: | 3,850 mm |
| Total wheelbase: | 6,350 mm |
| Service mass: | 62.3 t |
| Friction mass: | 47.4 t |
| Wheel set mass : | 16.0 t |
| Top speed: | 80 km / h |
| Indexed performance : | 382 kW |
| Driving wheel diameter: | 1,500 mm |
| Impeller diameter front: | 1,000 mm |
| Control type : | Heusinger |
| Number of cylinders: | 2 |
| Cylinder diameter: | 480 mm |
| Piston stroke: | 630 mm |
| Boiler overpressure: | 12 bar |
| Number of heating pipes: | 209 |
| Heating pipe length: | 4,000 mm |
| Grate area: | 1.73 m² |
| Radiant heating surface: | 8.7 m² |
| Tubular heating surface: | 107.7 m² |
| Evaporation heating surface: | 116.40 m² |
| Water supply: | 7.4 m³ |
| Fuel supply: | 2.5 tons of coal |
| Brake: | Knorr air brake |
| Data for wet steam version only! | |
The vehicles of type T 11 of the Prussian State Railways were passenger train tender locomotives with wet steam engines intended for use on the Berlin Stadtbahn .
history
470 machines of the series were procured between 1903 and 1910. The T 11 was developed together with the similar T 12 superheated steam locomotive from the T 9.3 in order to replace older tank locomotives that were only double-coupled . The construction of the T 11 was stopped after 1910 in favor of the T 12, which was more economical due to the superheated steam engine.
After the First World War , 22 machines came to Belgium for l'État Belge , 25 copies to France , 23 of them to the PLM and at least 52 to Poland to the PKP , to which four more must be added for the Free City of Danzig .
From 1923, 16 machines of the series were converted to superheated steam operation and equipped with a superheater . However, they kept their company numbers.
The Reichsbahn took over 358 locomotives as class 74 0-3 and numbers 74 001-358 in 1925 .
The locomotives were used together with the T 12 until they were electrified in 1926–1933, especially on the Berlin Stadtbahn, where they carried the directional signs on the smoke box and coal box. But they were also used in suburban traffic in other cities such as Frankfurt am Main and Hamburg and Altona.
At the beginning of the Second World War , the Reichsbahn took over 25 machines from the PKP, which it had previously operated as OKi1 .
Towards the end of the Second World War, 120 copies of these machines were still available, 65 on the Deutsche Bundesbahn and 55 on the Deutsche Reichsbahn . Most T 11s were retired by 1960; however, two copies (74 231 and 74 240) ran on the Erfurt industrial railway until 1974.
After the end of the war, the Polish PKP received 25 locomotives again, the last of which was taken out of service in 1966.
Two locomotives have been preserved, the 74 104 and the 74 231. The former remained in Poland after the Second World War.
The 74 231 locomotive, previously Hanover 7512, was refurbished in 1998/99 for the Minden Museum Railway (MEM) in the Meiningen steam locomotive works and has been in operation again since 2000. At the moment it is parked in Minden because of a boiler damage.
Constructive features and capabilities
The T 11 was designed with a riveted sheet metal frame that was also designed as a third water tank.
All four axles of the locomotives - including the running axle - are loaded equally with around 16 t. The running axle connected with the first coupling axle to form a Krauss-Helmholtz steering frame, the second and third coupling axles were fixed in the frame.
The long boiler consisting of two sections and the smoke chamber were made as a rivet construction. The fire box in the standing kettle was made of copper. Two suction steam jet pumps were installed as feed pumps.
The two-cylinder wet steam engine (with an external Heusinger control) was not placed below the chimney, but far back between the wheel set and the first coupling axle. This placement made the strikingly long inlet and outlet pipes of the steam engine necessary. The second coupled wheel set serves as the drive wheel set. The copies of the first delivery had piston valves, those of later deliveries had flat slide valves.
The air pump for the brake was installed on the right side of the locomotive next to the smoke chamber on the circulation; the two main air tanks were mounted on the two ends of the locomotive below the frame.
The T 11 series was able to pull a wagon mass of 165 t at 75 km / h and a 470 t at 60 km / h. On a gradient of six per thousand, 270 t could still be transported at 45 km / h.
T 11 of the Lübeck-Büchener Railway
The Lübeck-Büchener Eisenbahn (LBE) also put nine T 11s built between 1905 and 1908 into service.
The four vehicles with the numbers 74 361 to 74 364, which were taken over by the Deutsche Reichsbahn in 1938 , were not the Prussian T 11, which had already been retired or sold before the takeover, but in-house designs of the LBE, which corresponded more to the Prussian T 9.3 , and was built by Linke-Hofmann in a series of five in 1911/1912. With the exception of the smaller coupling wheels with a diameter of 1,400 mm, the engine corresponded to the T 11, while the boiler was smaller. The last of these locomotives was not retired until 1951.
Web links
literature
- Jürgen U. Ebel / Hansjürgen Wenzel: The series 74, The history of the Prussian T 11 and T 12. EK-Verlag, Freiburg 1995, ISBN 3-88255-142-9
- Andreas Helmedach: The T 10, T 11 and T 12 locomotives of the Lübeck-Büchener Railway. In: Lok Magazin , issue 89, March / April 1978, pp. 111–115.
- Manfred Weisbrod, Hans Müller, Wolfgang Petznick: German Locomotive Archive: Steam Locomotives 3 (Series 61 - 98). 4th edition, transpress, Berlin 1994, ISBN 3-344-70841-4 , p. 65 ff., P. 326 f.
Remarks
- ↑ Herbert Rauter: Prussia Report No. 3 . Hermann Merker Verlag GmbH, Fürstenfeldbruck 1991, ISBN 3-922404-19-7 , p. 89 .