Od102

 

 

KWStB 479 (Esslingen 3188/1901), Crailsheim depot, July 1908. Later this locomotive became DRG 13 1614 and was withdrawn in April 1928. Source: www.commons.wikimedia.org.

 

 

 Side drawing of class AD. Source: Lokomotiv-Archiv Württemberg (see References).

 

 

 

 

 

 

 

 

 

 

In order to replace elderly express locomotives with the 1-2-0 axle arrangement, Königlich Württembergischen Staats-Eisenbahnen (KWStE) ordered new 2-2-0s running on saturated steam with compound engines from Maschinenfabrik Esslingen. Prototype (3027/1899) was followed by 59 examples, classed AD; they were assigned service numbers from 441 to 500. Next batch, starting from No. 1501 (Esslingen 3260/1903), featured piston valves instead of slide ones previously used and numbered 38 examples, delivered until 1907. Class designation remained unchanged. Next two engines (Esslingen 3432/1907 and 3433/1907, KWStE 1539 and 1540, later re-numbered 1541 and 1542) were fitted with single-expansion steam engines and ran on superheated steam, with boiler pressure reduced from 14 to 12 bar. As they proved superior to earlier compounds in terms of tractive effort and economy, further fifteen examples were delivered in the superheated variant, classed ADh. Last of them was Esslingen 3520/1909. Both AD and ADh had two steam domes connected with a horizontal tube of large diameter; this feature was characteristic for many Austrian engines, but seldom encountered in Germany. They were coupled with two-axle 2T10 or three-axle 3T15.5 tenders.

Despite comparatively young age of these locomotives withdrawals started in early 1920s. DRG finally retained only 24 ADs (re-classed 1316, written off until 1928) and fourteen ADhs (re-classed 1317, withdrawn until 1932). Polish railways had only one locomotive of this type, of the compound variety (former KWStE 1538, Esslingen 3431/1907 – the last example built before switching to superheated ADh). As its axle arrangement was the same as that of Prussian class P42 and overall characteristics were similar, it was initially classed P4W, where upper index indicated the land of origin. In 1926 it was re-designated Od102-1. This locomotive was still in use in 1927, but disappeared before 1931. Not a single engine of this type has been preserved.

 

Main technical data*)

 

No.

Parameter

Unit

Value

1.

Years of manufacture

-

1899 – 1907   

2.

Total built / used in Poland

-

98 / 1

3.

Tender class

-

12C102

4.

Axle arrangement

-

2-2-0

5.

Design maximum speed

km/h

100

6.

Cylinder bore

mm

450 / 670

7.

Piston stroke

mm

560

8.

Engine rating

kW/hp

9.

Tractive effort

kG

5 500

10.

Boiler pressure

MPa

1.43

11.

Grate dimensions

m X m

2.0 m2

12.

Firebox heating surface

m2

9.8

13.

Distance between tube plates

mm

3 705

14.

Number of flue tubes

-

250

15.

Heating surface of flue tubes

m2

119.3

16.

Number of smoke tubes

-

-

17.

Heating surface of smoke tubes

m2

-

18.

Evaporating surface, total

m2

129.1

19.

Superheater heating surface

m2

-

20.

Diameter of drivers

mm

1 800

21.

Diameter of idlers front/rear

mm

850 / -

22.

Total weight, empty

kg

44 900

23.

Total weight, working order

kg

50 200

24.

Weight on drivers, working order

kg

29 200

25.

Weight with tender, empty

kg

26.

Weight with tender, working order

kg

82 300

27.

Maximum axle load

T

14.6

28.

Axle base (with tender)

mm

12 705

29.

Overall length (with tender)

mm

15 470

30.

Brake type

-

Westinghouse, steam

 

*) Data refer to class AD only.

 

References and acknowledgments

 

-       LP;

-       www.pl.wikipedia.org;

-       www.de.wikipedia.org;

-       Lokomotiv-Archiv Württemberg by Hermann Lohr and Georg Thielmann (Transpress, Berlin, 1988).