Mecklenburg XXI
| Mecklenburgische XXI Mecklenburgische T 4 DR series 91.19 DR series 91.640 |
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 No. 714 company photo
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| technical data see below |
The tank locomotives of the type XXI were from the 1907 Grand Duchy of Mecklenburg Friedrich-Franz Railway procured. These machines, designated as type T 4 from 1910 , were one of the few in-house developments of the Mecklenburg railways. All 50 locomotives were classified by the Deutsche Reichsbahn as class 91.19 in their numbering plan in 1925 . Another six locomotives, largely identical in construction, were acquired by the management of the small railways of the province of Saxony in 1919/1920. These locomotives were designated as 91 6401 to 6404 by the Deutsche Reichsbahn from 1949 . All locomotives were decommissioned by 1970. No copy has survived.
history
At the beginning of the 20th century, the Friedrich-Franz-Eisenbahn needed a powerful tank locomotive for the branch lines. Above all, this was intended to replace the older double and triple-coupled locomotives of the classes T 0, T 1, T 2 and T 3. The locomotives of the Prussian classes T 9.2 and T 9.3 were too heavy for the planned use. For this reason, the Friedrich-Franz-Eisenbahn commissioned Henschel & Sohn in Kassel with a construction based on these locomotives, but with the specification of a wheelset traveling mass of 12 tons. The machines should be able to move an 800 t train on the flat at 45 km / h and a 380 t train on an incline of 10 ‰ at 20 km / h. Henschel delivered the first locomotives in 1907. Several locomotives were delivered annually until 1922, until a stock of 50 copies was reached. In addition to Henschel, Orenstein & Koppel supplied 13 locomotives. Due to the different sizes of water boxes in the individual delivery series, the wheelset mass also varied between 11 and 13 tons.
All locomotives were taken over from the Deutsche Reichsbahn. The first wave of withdrawal took place in 1933/1934. Eleven machines were removed from active operations. In 1935 one of these locomotives was sold to the Wilstedt-Zeven-Tostedter Railway and a second to the Bad Zwischenahn – Edewechterdamm railway . Until the end of the Second World War, the Reichsbahn machines were stationed in the Schwerin area and at the Perleberg, Pritzwalk and Wittstock depots.
After 1945 four locomotives were stationed in the Heiligenhafen depot in the western zone . These locomotives were taken out of service in 1949/1950 and given to repair shops as work locomotives. Two locomotives remained in Poland and were given the designations TKi 100-1 and TKi 100-3. Of the locomotives that remained in the Eastern Zone, 16 locomotives had to be handed over to the Soviet Union in 1946/1947. There they were given the designation ТТ. On the Reichsbahn, the locomotives were mainly used in the area of the Wittenberge and Perleberg depots. Individual locomotives made it to Saxony, where they were used in areas such as Döbeln, Mittweida and the Schlematalbahn . Of the 16 locomotives that remained with the Reichsbahn in the GDR, four were still intended to be converted to EDP numbers. However, they were all retired by April 1970.
The small railroad department of the Provincial Association of Saxony procured six locomotives of this type for three of the railways it manages in 1919/1920. The locomotives made by Henschel were a little heavier, but otherwise corresponded to the Mecklenburg design. Kleinbahn-AG received two locomotives in Genthin . The locomotives were given the track numbers 10 and 11. However, they were handed over to the Altona-Kaltenkirchen-Neumünster railway in 1921 . Two locomotives came to the Gardelegen-Haldensleben-Weferlinger Railway and the Salzwedeler Kleinbahn . They were given the operating numbers 351 to 354. When the Deutsche Reichsbahn took over management of the private railways in 1949, the locomotives were renamed 91 6401 to 6404. Until they were retired in 1964, they were used by the Stendal and Salzwedel depots.
Constructive features
The locomotives had an internal sheet metal frame.
The riveted kettle consisted of two shots . The steam dome sat on the first boiler shot. The fire box and studs are made of copper. The Ramsbottom safety valve is in front of the cab.
The horizontally arranged two-cylinder wet steam engine on the outside worked on the middle drive wheel set . The external Heusinger control had hanging iron . The replicas of the Provincial Association of Saxony had a single-rail and a front piston rod guide instead of a double- rail crosshead .
The chassis is supported at four points. The leaf springs of the wheel set and the first coupling axle are at the same height as the circulation and are connected by a large compensation lever. The two rear axles have leaf springs below the axle bearing which are also connected by means of compensating levers. The wheel set and the first coupled wheel set form a Krauss-Helmholtz steering frame with a lateral displacement of 22 mm each. The replicas had a side shiftability of 26 mm.
The locomotives possessed a Knorr - air brakes with auxiliary brake and a Extersche throw lever brake. The air brake acted on the second and third coupled wheels from the front. In the replicas, all coupled gear sets were braked. The sandpit sat on the rear boiler section and sanded the front coupling gear set when driving forward and the middle coupling gear set when driving backwards.
The water supplies were in riveted water boxes on both sides of the boiler, they reached up to the level of the sandpit. In the replicas, the water tanks were extended to the level of the steam dome. The coal supplies were housed behind the driver's cab.
Technical specifications
| Numbering: | MFFE 701-730 91 1901-1930 |
MFFE 731-734 91 1931-1934 |
MFFE 735-736 91 1935-1936 |
MFFE 737-738 91 1937-1938 |
MFFE 739-747 91 1939-1947 |
MFFE 701-736 91 1948-1950 |
91 6401-6404 |
| Number: | 30th | 4th | 2 | 2 | 9 | 3 | 6th |
| Manufacturer : | Henschel , O&K | Henschel | OK | Henschel | |||
| Year of construction (s): | 1907-1914 | 1915 | 1916 | 1918 | 1919/1921 | 1922 | 1919/1920 |
| Retirement: | -1967 | ||||||
| Axis formula : | 1'C n2t | ||||||
| Genre : | Gt 34.12 | Gt 34.12 | Gt 34.12 | Gt 34.11 | Gt 34.12 | Gt 34.13 | Gt 34.14 |
| Gauge : | 1435 mm | ||||||
| Length over buffers: | 10,375 mm | 10,800 mm | |||||
| Height: | 4150 mm | ||||||
| Total wheelbase: | 5600 mm | 5600 mm | |||||
| Empty mass: | 35.68 t - 37.0 t | 36.87 t - 37.0 t | 37.40 t | ||||
| Service mass: | 45.24 t - 46.10 t | 46.10 t - 46.80 t | 45.60 t | 46.10 t - 46.80 t | 46.80 t | 52.00 t | |
| Friction mass: | 36.00 t - 36.10 t | 36.10 t - 36.20 t | 35.60 t | 36.10 t | 36.60 t | 41.90 t | |
| Wheel set mass : | 12.00 t | 12.00 t - 12.07 t | 11.80 t | 12.00 t - 12.07 t | 12.20 t | 14.00 t | |
| Top speed: | 45 km / h | 50 km / h | 45 km / h | ||||
| Driving wheel diameter: | 1150 mm | 1200 mm | 1150 mm | ||||
| Impeller diameter: | 800 mm | ||||||
| Control type : | Heusinger | ||||||
| Cylinder diameter: | 410 mm | 430 mm | |||||
| Piston stroke: | 580 mm | ||||||
| Boiler overpressure: | 12 bar | ||||||
| Number of heating pipes: | 173 | ||||||
| Heating pipe length: | 3700 mm | 4000 mm | |||||
| Grate area: | 1.60 m² | 1.90 m² | |||||
| Radiant heating surface: | 7.41 m² | 7.44 m² | 8.40 m² | ||||
| Tubular heating surface: | 92.5 m² | 89.5 m² | |||||
| Evaporation heating surface: | 99.91 m² | 99.94 m² | 97.5 m² | ||||
| Water supply: | 5.1 m³ | 5.1 m³ - 5.3 m³ | 4.3 m³ | 5.1 m³ - 5.3 m³ | 5.6 m³ | 6 m³ | |
| Fuel supply: | 1.5 tons of coal | 2 tons of coal | |||||
| The technical information differs in the literature. | |||||||
literature
- Hans-Joachim Kirsche, Hermann Lohr, Georg Thielmann: Lokomotiv-Archiv Mecklenburg / Oldenburg . transpress, Berlin 1989, ISBN 3-344-00326-7 .
- Manfred Weisbrod, Hans Müller, Wolfgang Petznick: German Locomotive Archive: Steam Locomotives 3 (Series 61 - 98) . transpress, Berlin 1994, ISBN 3-344-70841-4 .
- Manfred Weisbrod, Hans Wiegard: German Locomotive Archive: Steam Locomotives 6 (standard gauge private railway locomotives at the DR) . transpress, Berlin 1998, ISBN 3-344-71044-3 .
Individual evidence
- ↑ German Locomotive Archive: Steam Locomotives 6, p. 175