Provinzialverband Sachsen 2-6-2 Locomotives in Germany

Class Details by Steve Llanso of Sweat House Media

Class Elna type 7 (Locobase 21153)

Data from "Baureihe 75 6682-6687" on Albert Gieseler's Dampfmaschinen und Lokomotiven website at [], last accessed 4 September 2023; and "ELNA 7" in Wikipedia at [], last accessed 28 August 2023. See also "Kleinbahnabteilung des Provinzialverbandes Sachsen" in Wikipedia at [], last accessed 4 September 2023. This latter source provides links to all the standard-gauge kleinbahns in Saxony. Henschel works numbers were 24751-24752 25928 in 1940, 25991 in 1941; 26459, 26499 in 1942.

This class bears a strong resemblance to the earlier ELNA 2-6-0s, but with a trailing axle under the footplate. Like most other ELNAs the Sachsen engines had high-place boilers fo ease maintenance access and a T-shape water tank placed below the coal bunker behind the cab. In this set, the ELNA 7s displayed the largest boilers, fireboxes, and grates and highest boiler pressure. The adjusted superheater ratio is significantly higher than most other small tank locomotives.

Either soft coal or low-calorie lignite coal might have been burned in the firebox. If it was the latter, the engine's demand required extending the coal space to the roof of the cab.

NB: As in most German steam locomotive data tables that include tube counts, lengths, and diameters, the tube heating surface comes from the interior (fire side) diameter, which when added to the firebox heating surface area, came to 98.4 sq m (1,069 sq ft). Locobase uses the exterior (water side) diameter, which is the single tube diameter measured. As a result, superheat ratios compare directly to those locomotives of Anglo-American origin

The kleinbahn department of the Provinzialverbandes Sachsen doled out the six locomotives to five small railways:

Genthiner Kleinbahn (Nr. 401 und 402)

Salzwedeler Kleinbahnen (Nr. 403)

Kleinbahn Heudeber-Mattierzoll (Nr. 404)

Kleinbahn Gardelegen-Haldensleben-Weferlingen (Nr. 405), and

Altmärkischen Kleinbahn zugeteilt.(406). (This engine was the only one on the Altmark to have either a leading or trailing truck.)

They proved powerful enough to haul ten passenger cars at the fastest maximum speed (70 kph/43.5 mph) of any ELNA. After 1953, the DDR's Reichbahn concentrated the class at Haldensleben. Nine years later they moved to Dessau to handle traffic on the Dessau-Gohrau-Rehsen railway. By 1965, the sextet had individual assignments and by 1968, they were reitred.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassElna type 7
Locobase ID21153
RailroadProvinzialverband Sachsen (Saxony Provincial Assoc)
Number in Class6
Road Numbers401-406/BR 75 6682-6687
Number Built6
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)19.69 / 6
Engine Wheelbase (ft / m)24.93 / 7.60
Ratio of driving wheelbase to overall engine wheelbase 0.79
Overall Wheelbase (engine & tender) (ft / m)24.93 / 7.60
Axle Loading (Maximum Weight per Axle) (lbs / kg)31,085 / 14,100
Weight on Drivers (lbs / kg)91,712 / 41,600
Engine Weight (lbs / kg)142,418 / 64,600
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)142,418 / 64,600
Tender Water Capacity (gals / ML)1848 / 7
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.80 / 2.50
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)47.20 / 1199
Boiler Pressure (psi / kPa)232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)18.9" x 21.65" / 480x550
Tractive Effort (lbs / kg)32,325 / 14662.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 2.84
Heating Ability
Tubes (number - dia) (in / mm)84 - 1.772" / 45
Flues (number - dia) (in / mm)41 - 4.252" / 108
Flue/Tube length (ft / m)12.47 / 3.80
Firebox Area (sq ft / m2)103.33 / 9.60
Grate Area (sq ft / m2)30.14 / 2.80
Evaporative Heating Surface (sq ft / m2)1158 / 107.60
Superheating Surface (sq ft / m2)459 / 42.60
Combined Heating Surface (sq ft / m2)1617 / 150.20
Evaporative Heating Surface/Cylinder Volume164.72
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6995
Same as above plus superheater percentage8954
Same as above but substitute firebox area for grate area30,698
Power L115,079
Power MT1087.43

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