Saxon M I TV

The Saxon class M I T${\displaystyle \textstyle {\mathfrak {V}}}$ was a class of two German 0-4-4-0 Meyer tank locomotives built for the Royal Saxon State Railways (German: Königlich Sächsischen Staatseisenbahnen, K.Sä.St.E.)

M I TV
Number(s)	822/823 from 1892: 1399/1400
Quantity	2
Manufacturer	Sächsische Maschinenfabrik, Chemnitz
Year(s) of manufacture	1890/1891
Retired	1922
Axle arrangement	B′B′ n4vt
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	9,934 mm (32 ft 7 in)
Empty weight	43.8 tonnes (43.1 long tons; 48.3 short tons)
Service weight	54.4 tonnes (53.5 long tons; 60.0 short tons)
Adhesive weight	51.1 tonnes (50.3 long tons; 56.3 short tons)
Axle load	12.8 tonnes (12.6 long tons; 14.1 short tons)
Top speed	45 km/h (28 mph)
Starting tractive effort	50 kN (11,000 lbf)
Driving wheel diameter	1,120 mm (3 ft 8 in)
Valve gear	Walschaerts (Heusinger)
No. of cylinders	4
LP cylinder bore	460 millimetres (18 ^1⁄8 in)
HP cylinder bore	300 millimetres (11 ^13⁄16 in)
Piston stroke	533 millimetres (21 in)
Boiler Overpressure	12 kg/cm^2 (1,180 kPa; 171 psi)
No. of heating tubes	174
Heating tube length	3,700 mm (12 ft 1 ^3⁄4 in)
Grate area	1.4 m^2 (15 sq ft)
Radiative heating area	5.5 m^2 (59 sq ft)
Tube heating area	80.9 m^2 (871 sq ft)
Evaporative heating area	86.4 m^2 (930 sq ft)
Water capacity	5.15 m^3 (1,130 imp gal)
Fuel	1.7 tonnes (1.7 long tons; 1.9 short tons)
Brakes	Steam brake counterweight brake

History

In 1890, the Sächsische Maschinenfabrik in Chemnitz developed a Günther-Meyer articulated locomotive for operation on the winding branchlines of the Ore Mountains. However, only two locomotives with the serial numbers 1658 and 1659 were built. The two locomotives were given the fleet numbers 822 and 823 and the names RASCHAU and CROTTENDORF.[1]

Initially, they were classified as H M I TV. From 1896 they were then called M I TV; from 1900 they were referred to as I TV.

The locomotives did not prove themselves, so that initially no further locomotives of this type were procured. The locomotives tended to run unevenly, especially at higher speeds. In addition, there was an increased tendency to slip when starting. Similar locomotives were procured for the Saxon narrow-gauge railways as class IV K from 1892.

It was only after the turn of the century that powerful and particularly curvy locomotives were needed for the Windbergbahn near Dresden that locomotives of the same type were built. However, these differed significantly from the original design (see Saxon I TV).

The two M I TV locomotives were withdrawn from service in 1922, and the Deutsche Reichsbahn gave them no new numbers.

Technical features

The locomotives had a two-ring boiler with a Crampton firebox. Two non-lifting Friedmann injectors were used to feed the boiler

The steam circuit was designed as a four-cylinder compound drive with Walschaerts valve gear (Heusinger) and flat slide valves. The smaller high-pressure cylinders were on the rear bogie, the larger low-pressure cylinders on the front bogie. The bogies were connected by a coupling iron in order to reduce any counter-rotating movements.

The water supply was housed in side tanks, the coal in a bunker behind the driver's cab.

The locomotives originally only had a steam brake as braking equipment, supplemented by a counterweight brake. Westinghouse air brakes were later retrofitted.

As special equipment, they were provided with a Latowski-type of steam-driven bell.

References

1. Reiche (1998), p. 146.

• Näbrich, Fritz; Meyer, Günter; Preuß, Reiner (1983). Lokomotivarchiv Sachsen 2 (in German). Berlin / Düsseldorf: transpress VEB Verlag für Verkehrswesen / Alba Publikation Alf Teloeken GmbH + Co KG. ISBN 3-87094-096-4.
• Preuß, Erich; Preuß, Reiner (1991). Sächsische Staatseisenbahnen (in German). Berlin: transpress Verlagsgesellschaft mbH. ISBN 3-344-70700-0.
• Reiche, Günther (1998). Richard Hartmann und seine Lokomotiven (in German). Chemnitz: Oberbaumverlag. ISBN 3-928254-56-1.
• Schubert, Jürgen (1982). Die Windbergbahn (in German). Berlin / Düsseldorf: Transpress VEB Verlag für Verkehrswesen / Alba-Verlag. ISBN 3-87094-202-9.