Saxon IIb T
| K. Saxons. Sts. EB - IIb T Oberhohndorf – Reinsdorf No. 1 - 4 BOCKWA and MULDENTHAL |
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| Number: | 10 | ||
| Manufacturer : | Richard Hartmann , Chemnitz | ||
| Year of construction (s): | 1856 | 1859-1862 | 1874 |
| Retirement: | 1892-1952 | ||
| Axis formula : | 1'B n2t | ||
| Gauge : | 1435 mm | ||
| Length over buffers: | 8610 mm | ||
| Height: | 4169 mm | ||
| Fixed wheelbase: | 1550 mm | ||
| Total wheelbase: | 3575 mm | ||
| Empty mass: | 27.8 t | 29.3 t | 30.0 t |
| Service mass: | 32.5 t | 34.0 t | 37.4 t |
| Friction mass: | 26.7 t | 26.9 t | 29.4 t |
| Wheel set mass : | 13.4 t | 13.5 t | 14.7 t |
| Top speed: | 50 km / h | ||
| Coupling wheel diameter: | 1370 mm | 1390 mm | |
| Impeller diameter: | 765 mm | 805 mm | |
| Control type : | Stephenson | Allan | |
| Number of cylinders: | 2 | ||
| Cylinder diameter: | 381 mm | ||
| Piston stroke: | 560 mm | ||
| Boiler overpressure: | 7.0 atm | 8.5 atm | |
| Number of heating pipes: | 148 | 147 | |
| Heating pipe length: | 3950 mm | 3920 mm | |
| Grate area: | 0.8 m² | 1.1 m² | |
| Radiant heating surface: | 5.3 m² | 6.1 m² | 5.9 m² |
| Tubular heating surface: | 72.3 m² | 72.5 m² | |
| Evaporation heating surface: | 77.6 m² | 78.3 m² | 78.4 m² |
| Water supply: | 1.9 m³ | 2.2 m³ | 3.2 m³ |
| Coal supply: | 1.0 t | 1.3 t | |
| Brakes: | Screw brake | steam | |
The Saxon IIb T were double-coupled tank locomotives of the Royal Saxon State Railways for mixed service, which came from the Upper Ore Mountains State Railways and the Western State Railways . The Oberhohndorf-Reinsdorfer coal railway and the Bockwaer railway company acquired locomotives of the same design for their coal railways in the Zwickau area . The MULDENTHAL locomotive is the oldest surviving Saxon locomotive, and has been on display in the Dresden Transport Museum since 1956 .
history
The first locomotive was built by the Richard Hartmann machine works in 1856 with the serial number 74 for the Upper Ore Mountains State Railways. It was named SCHWARZENBERG and rail number 53. Already under the management of the Royal Directorate of the Western State Railways, three more locomotives named SCHNEEBERG , NEUSTÄDTEL and HERCULES were added in 1859 and 1862 , which were intended for operation on the Niederschlema – Schneeberg-Neustädtel route were. They were given the track numbers 58, 59 and 108.
In the Royal Saxon State Railways the locomotives from 1868 were genus H IV , from 1876 as H T IV , from 1885 H IVb T and from 1896 as IVb T out. From 1900 they were classified in the class IIb T, with the "b" standing for movable barrel axis . The four locomotives were given the new track numbers 1696 to 1699 in 1892. The track number 1696 was retired in 1892, the remaining three locomotives followed in 1903.
The Oberhohndorf-Reinsdorfer coal railway acquired three machines in 1860 and 1864. They were given the track numbers 1 to 3 and the names OBERHOHNDORF , REINSDORF and SCHAFF . In 1874 there was also the SCHEDEWITZ with track number 4. The SCHAFF locomotive bore the name of the former director of the coal railway, Georg Theodor Schaff. The retirement dates are unknown.
The Bockwaer Eisenbahngesellschaft owned two locomotives, which were put into service in 1861 as BOCKWA and MULDENTHAL . In the German War of 1866, the Prussians confiscated the MULDENTHAL as supposed state property for their own purposes, but soon returned it to its owner. The BOCKWA drove on its original route until 1918 and was then replaced by a second-hand machine of the Prussian type T 3 with the same name .
The MULDENTHAL , on the other hand, came to the Erzgebirge Coal Association (ESTAV) as a works locomotive in 1923, where it remained in operation for several decades. It last ran in the VEB Steinkohlenwerk August Bebel , where it was secured in 1952 with 91 years of service for the Dresden Transport Museum, which is currently under construction. Employees of the Raw "Einheit" Leipzig took on the museum reconditioning in voluntary working hours and put it almost in the delivery condition without a driver's cab. MULDENTHAL has been part of the permanent exhibition in the Johanneum am Neumarkt since 1956 .
technical features
With its semicircular, continuous boiler roof, the boiler corresponded to the building principles customary at the time. The boiler was originally fed by two drive pumps, from no. 108 by injectors. A regulator attachment with two spring balance safety valves was arranged on the standing boiler, the large steam dome with a third safety valve was located in the middle of the boiler. The inlet pipes to the cylinders were on the outside of the boiler. The originally cylindrical chimney was later replaced by a conical one.
The steam engine was designed as a two-cylinder wet steam engine with simple steam expansion and Stephenson control. In deviation from this, the SCHEDEWITZ had an all-control system. The cylinders were built horizontally and had sloping shell slides.
The drive and coupling axles were firmly mounted in a fork frame with lower straps, the second axle served as the drive axle. The running axles were guided in a drawbar frame with a pivot distance of 1.4 m for good cornering. The state railroad locomotives received Novotny steering axles from 1875, increasing the length of the track to 3.58 m. The SCHEDEWITZ had a sheet metal frame and received the Novotny steering axle ex works.
With the exception of the SCHEDEWITZ , all locomotives only had one screw brake on delivery, which acted on the driving axle on one side. The Schedewitz instead had a vapor barrier. From 1869, a steam carriage brake and a throw lever brake were retrofitted to the state railway locomotives.
The water and coal supplies were carried in side containers. From 1865 onwards, all locomotives were equipped with permanent cabs. For operation on the newly created secondary railways , the locomotives were fitted with a steam turret at the top of the boiler from 1880.
Driver's cab with boiler fittings, on the left the (empty) coal box
Engine
Detail of the driving wheel set with one-sided block brake
Wheelset guided in the drawbar frame
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literature
- Fritz Näbrich, Günter Meyer, Reiner Preuß: Lokomotivarchiv Sachsen 2 . transpress VEB publishing house for transport, Berlin, 1983, or Alba publication Alf Teloeken GmbH + Co KG, Düsseldorf, ISBN 3-87094-096-4 , pp. 64-68.
- Norbert Peschke : The Zwickau hard coal mining and its coal railways. Zschiesche GmbH, Wilkau-Haßlau 2007, ISBN 3-9808512-9-X .
