Tr1

 

 

Warschau 4464, Deutsche Heeresbahn, Esslingen 3808/1917, location and date unknown.  This locomotive later became 56 003 and was withdrawn before 1926. Source: Lokomotiven der alten deutschen Staats- und Privatbahnen by H.Maey and E.Born (Transpress, 1983).

 

 

 Side drawing of class G73, © M.Kratochvil (TB vol. 1).

  

 

 

 

 

 

 

 

 

 

 

Prussian class G73 was developed from earlier G72, built in considerable numbers (1646 examples, plus several more for other railways). The intention was to reduce axle load and improve running qualities, so that new locomotive could work freight trains on demanding lines with tight curves. For this purpose, lead Adams truck was used, certainly not typical with maximum speed of merely 45 km/h. Compound steam engine of class G72 was retained and boiler was slightly enlarged.

Two prototypes (Hanomag 2499/1893 and 2500/1893) were assigned to the Hannover regional management. Due to general improvement of track quality and increase of acceptable axle loads, class G73 enjoyed a very modest production run, only fifteen examples being built by Hanomag between 1893 and 1895. They were typically coupled with three-axle 3T12 tenders. During the war it was found that such locomotive might be very useful on Eastern front, where track quality was generally inferior to that typical for the KPEV network. Further orders were thus placed and between 1916 and 1917 seventy examples were delivered to Militär-Eisenbahndirektion Warschau by Maffei (39), Krauss (thirteen) and Esslingen (eighteen). These featured boiler pressure increased from 12 to 14 bar and typically ran with larger three-axle 3T16,5 tenders. After the war only six examples were kept by DRG, but one (Hanomag 2669/1894) was erroneously included in former class G72 and numbered 55 701; the rest were classed 560. All were withdrawn before 1926, but in 1938 DRG acquired two more G73s, sold to Lübeck-Büchener Eisenbahn in 1924; both survived until 1945, with one ending up in the Soviet Union and the other one in Yugoslavia (JDŽ 24-101).

As many as 33 locomotives of this type, left by retreating German forces, were taken over by Polish railways after the war. Later they were classed Tr1. Due to their low axle load and ability to negotiate tight curves they served in eastern and south-eastern Poland, so all fell in 1939 into Soviet hands, except Tr1-3 (prototype Hanomag 2499/1893), which was withdrawn in February 1938. One (Tr1-14, Maffei 4722/1916) was captured by Germans and finally ended up in Romania (CFR 40.921). The fate of the remaining Polish Tr1s is not known, but none was returned. According to one source (Jukka Nurminenwww.scado.narod.ru), these locomotives were impressed not into NKPS, but into Gulag railways; confirmation is lacking and this question requires further study.  No G73 has been preserved.

 


Main technical data

 

No.

Parameter

Unit

Value

1.

Years of manufacture

-

1893 –1917 

2.

Total built / used in Poland

-

85 / 33

3.

Tender class

-

4.

Axle arrangement

-

1-4-0

5.

Design maximum speed

km/h

45

6.

Cylinder bore

mm

500 / 750

7.

Piston stroke

mm

630

8.

Engine rating

kW/hp

650 / 880

9.

Tractive effort

kG

10.

Boiler pressure

MPa

1/22 / 1.431)

11.

Grate dimensions

m X m

2.28 m2

12.

Firebox heating surface

m2

10.8

13.

Distance between tube plates

mm

4 100

14.

Number of flue tubes

-

235

15.

Heating surface of flue tubes

m2

136.1

16.

Number of smoke tubes

-

-

17.

Heating surface of smoke tubes

m2

-

18.

Evaporating surface, total

m2

146.9

19.

Superheater heating surface

m2

-

20.

Diameter of drivers

mm

1250

21.

Diameter of idlers front/rear

mm

1000 / -

22.

Total weight, empty

kg

49 700 / 54 1001)

23.

Total weight, working order

kg

56 200 / 60 5001)

24.

Weight on drivers, working order

kg

50 500 / 52 5001)

25.

Weight with tender, empty

kg

26.

Weight with tender, working order

kg

27.

Maximum axle load

T

12.6 / 13.11)

28.

Axle base (with tender)

mm

13 025 / 14 1051)

29.

Overall length (with tender)

mm

16 318 / 17 3521)

30.

Brake type

-

 

1)    Second production run (1916 – 1917).

 

References and acknowledgments

 

-       www.beitraege.lokomotive.de/datenbank (databank by Ingo Hütter);

-       LP, TB vol. 1;

-       Lokomotiv-Archiv Preußen Band 2 by Andreas Wagner (Bechtermünz Verlag, 1996).