Saxon IV K
| Saxon IV K DRG Class 99.51–60 |
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Saxon IV K
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| Number(s) | see text |
| Quantity | 96 |
| Manufacturer | Sächsische Maschinenfabrik, Chemnitz |
| Year(s) of manufacture | 1892–1921 |
| Wheel arrangement | 0-4-4-0 |
| Axle arrangement | B’B’ n4v |
| Type | K 44.7 / K 44.8 * |
| Track gauge | 750 mm (2 ft 5 1⁄2 in) |
| Length over couplers | 9,000 mm (29 ft 6 in) |
| Height | 3,150 mm (10 ft 4 in) |
| Width | 1,980 mm (6 ft 6 in) |
| Overall wheelbase | 6,200 mm (20 ft 4 in) |
| Empty weight | 21.70–22.40 t |
| Service weight | 26.8–29.3 t |
| Adhesive weight | 26.8–29.3 t |
| Axle load | 6.7–7.3 t |
| Top speed | 30 km/h (19 mph) |
| Indicated Power | 210 PSi / 154 kW |
| Starting tractive effort | 36.28 kN / 42.17 kN ** |
| Driving wheel diameter | 760 mm (30 in) |
| Valve gear | Walschaerts (Heusinger) |
| No. of cylinders | 4 |
| LP cylinder bore | 370–400 mm (15–16 in) |
| HP cylinder bore | 240 mm (9.4 in) |
| Piston stroke | 380 mm (15 in) |
| Boiler Overpressure | 12/14/15 bar |
| Grate area | 0.97 m2 (10.4 sq ft) |
| Radiative heating area | 4.07 m2 (43.8 sq ft) |
| Evaporative heating area | 49.87 m2 (536.8 sq ft) |
| Water capacity | 2.4 m3 (530 imp gal) |
| Fuel | 0.85 t / 1.02 t *** |
| Auxiliary brake | Counterweight brake |
| Locomotive brakes | Vacuum brake |
| Train brakes |
Heberlein brake Vacuum brake |
| * from 99 581 ** from 99 551 *** from 99 561 |
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The Saxon IV K were eight-wheeled, narrow gauge, Günther-Meyer type steam engines built for the Royal Saxon State Railways with a track gauge of 750 mm (2 ft 5 1⁄2 in). A total of 96 were built between 1892 and 1921, making the Saxon IV K the most numerous narrow gauge locomotive in Germany. In 1925 the Deutsche Reichsbahn grouped these engines into their DRG Class 99.51–60.
As a result of the constantly rising traffic on the Saxon narrow gauge railways towards the end of the 19th century, the power of the existing Saxon I K and III K soon proved insufficient. So the Sächsische Maschinenfabrik developed an engine with eight coupled wheels and which had a larger boiler and adhesive weight. Unlike its predecessors, it was given two driven bogies in order to be able to cope with winding routes despite its length.
Between 1892 and 1921 a total of 96 locomotives were built with running numbers 103 to 198. To begin with they were designated as class H M T K V, which meant that they were locomotives built by Hartmann (H) to a Meyer design (M) as a tank engine (T) with a 750mm rail gauge (K) and compound engine (V). From 1896 they were reclassified as K IV and from 1900 as IV K. The 'K' stood for Kleinspur or 'small gauge'.
The IV K was used both in front of passenger trains and also goods trains and proved itself so well that it ousted the other locomotive classes completely on several lines.
Five locomotives (123, 139, 147, 148 and 174) were deleted from the roster after World War I. Two had been left behind in Hungary, and three were handed over to Poland as reparations. In 1925 the Deutsche Reichsbahn-Gesellschaft took over the remaining 91 units allocating them the numbers 99 511–546, 99 551–558, 99 561–579 and 99 581–608.
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